CVE-2026-80231 - Vulnerability Details - OpenCVE

A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup
for a given hostname even when using a different Native CA Store setting
(`CURLSSLOPT_NATIVE_CA`) than when the connection was created.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00215.

Key SSVC decision points have not yet been added.

Vendors	Products
Curl Subscribe	Curl Subscribe

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products
Curl Subscribe	Curl Subscribe

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://curl.se/docs/CVE-2026-80231.html
https://curl.se/docs/CVE-2026-80231.json
https://hackerone.com/reports/3969368

History

Sun, 06 Sep 2026 20:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-295

Sun, 06 Sep 2026 19:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Curl Curl curl
Vendors & Products		Curl Curl curl

Sun, 06 Sep 2026 18:00:00 +0000

Type	Values Removed	Values Added
Description		A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting (`CURLSSLOPT_NATIVE_CA`) than when the connection was created.
Title		native CA store conn reuse
References		https://curl.se/docs/CVE-2026-80231.html https://curl.se/docs/CVE-2026-80231.json https://hackerone.com/reports/3969368

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-09-06T17:48:38.062Z

Updated: 2026-09-06T17:48:38.062Z

Reserved: 2026-08-26T04:24:27.361Z

Link: CVE-2026-80231

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-06T18:17:22.500

Modified: 2026-09-06T18:17:22.500

Link: CVE-2026-80231

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-06T20:30:04Z

Weaknesses

CWE-295

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80231", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-08-26T04:24:27.361Z", "datePublished": "2026-09-06T17:48:38.062Z", "dateUpdated": "2026-09-06T17:48:38.062Z"}, "containers": {"cna": {"title": "native CA store conn reuse", "descriptions": [{"lang": "en", "value": "A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup\nfor a given hostname even when using a different Native CA Store setting\n(`CURLSSLOPT_NATIVE_CA`) than when the connection was created."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-09-06T17:48:38.062Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-488 Exposure of Data Element to Wrong Session"}]}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "8.21.0", "status": "affected", "lessThanOrEqual": "8.21.0", "versionType": "semver"}, {"version": "8.20.0", "status": "affected", "lessThanOrEqual": "8.20.0", "versionType": "semver"}, {"version": "8.19.0", "status": "affected", "lessThanOrEqual": "8.19.0", "versionType": "semver"}, {"version": "8.18.0", "status": "affected", "lessThanOrEqual": "8.18.0", "versionType": "semver"}, {"version": "8.17.0", "status": "affected", "lessThanOrEqual": "8.17.0", "versionType": "semver"}, {"version": "8.16.0", "status": "affected", "lessThanOrEqual": "8.16.0", "versionType": "semver"}, {"version": "8.15.0", "status": "affected", "lessThanOrEqual": "8.15.0", "versionType": "semver"}, {"version": "8.14.1", "status": "affected", "lessThanOrEqual": "8.14.1", "versionType": "semver"}, {"version": "8.14.0", "status": "affected", "lessThanOrEqual": "8.14.0", "versionType": "semver"}, {"version": "8.13.0", "status": "affected", "lessThanOrEqual": "8.13.0", "versionType": "semver"}, {"version": "8.12.1", "status": "affected", "lessThanOrEqual": "8.12.1", "versionType": "semver"}, {"version": "8.12.0", "status": "affected", "lessThanOrEqual": "8.12.0", "versionType": "semver"}, {"version": "8.11.1", "status": "affected", "lessThanOrEqual": "8.11.1", "versionType": "semver"}, {"version": "8.11.0", "status": "affected", "lessThanOrEqual": "8.11.0", "versionType": "semver"}, {"version": "8.10.1", "status": "affected", "lessThanOrEqual": "8.10.1", "versionType": "semver"}, {"version": "8.10.0", "status": "affected", "lessThanOrEqual": "8.10.0", "versionType": "semver"}, {"version": "8.9.1", "status": "affected", "lessThanOrEqual": "8.9.1", "versionType": "semver"}, {"version": "8.9.0", "status": "affected", "lessThanOrEqual": "8.9.0", "versionType": "semver"}, {"version": "8.8.0", "status": "affected", "lessThanOrEqual": "8.8.0", "versionType": "semver"}, {"version": "8.7.1", "status": "affected", "lessThanOrEqual": "8.7.1", "versionType": "semver"}, {"version": "8.7.0", "status": "affected", "lessThanOrEqual": "8.7.0", "versionType": "semver"}, {"version": "8.6.0", "status": "affected", "lessThanOrEqual": "8.6.0", "versionType": "semver"}, {"version": "8.5.0", "status": "affected", "lessThanOrEqual": "8.5.0", "versionType": "semver"}, {"version": "8.4.0", "status": "affected", "lessThanOrEqual": "8.4.0", "versionType": "semver"}, {"version": "8.3.0", "status": "affected", "lessThanOrEqual": "8.3.0", "versionType": "semver"}, {"version": "8.2.1", "status": "affected", "lessThanOrEqual": "8.2.1", "versionType": "semver"}, {"version": "8.2.0", "status": "affected", "lessThanOrEqual": "8.2.0", "versionType": "semver"}, {"version": "8.1.2", "status": "affected", "lessThanOrEqual": "8.1.2", "versionType": "semver"}, {"version": "8.1.1", "status": "affected", "lessThanOrEqual": "8.1.1", "versionType": "semver"}, {"version": "8.1.0", "status": "affected", "lessThanOrEqual": "8.1.0", "versionType": "semver"}, {"version": "8.0.1", "status": "affected", "lessThanOrEqual": "8.0.1", "versionType": "semver"}, {"version": "8.0.0", "status": "affected", "lessThanOrEqual": "8.0.0", "versionType": "semver"}, {"version": "7.88.1", "status": "affected", "lessThanOrEqual": "7.88.1", "versionType": "semver"}, {"version": "7.88.0", "status": "affected", "lessThanOrEqual": "7.88.0", "versionType": "semver"}, {"version": "7.87.0", "status": "affected", "lessThanOrEqual": "7.87.0", "versionType": "semver"}, {"version": "7.86.0", "status": "affected", "lessThanOrEqual": "7.86.0", "versionType": "semver"}, {"version": "7.85.0", "status": "affected", "lessThanOrEqual": "7.85.0", "versionType": "semver"}, {"version": "7.84.0", "status": "affected", "lessThanOrEqual": "7.84.0", "versionType": "semver"}, {"version": "7.83.1", "status": "affected", "lessThanOrEqual": "7.83.1", "versionType": "semver"}, {"version": "7.83.0", "status": "affected", "lessThanOrEqual": "7.83.0", "versionType": "semver"}, {"version": "7.82.0", "status": "affected", "lessThanOrEqual": "7.82.0", "versionType": "semver"}, {"version": "7.81.0", "status": "affected", "lessThanOrEqual": "7.81.0", "versionType": "semver"}, {"version": "7.80.0", "status": "affected", "lessThanOrEqual": "7.80.0", "versionType": "semver"}, {"version": "7.79.1", "status": "affected", "lessThanOrEqual": "7.79.1", "versionType": "semver"}, {"version": "7.79.0", "status": "affected", "lessThanOrEqual": "7.79.0", "versionType": "semver"}, {"version": "7.78.0", "status": "affected", "lessThanOrEqual": "7.78.0", "versionType": "semver"}, {"version": "7.77.0", "status": "affected", "lessThanOrEqual": "7.77.0", "versionType": "semver"}, {"version": "7.76.1", "status": "affected", "lessThanOrEqual": "7.76.1", "versionType": "semver"}, {"version": "7.76.0", "status": "affected", "lessThanOrEqual": "7.76.0", "versionType": "semver"}, {"version": "7.75.0", "status": "affected", "lessThanOrEqual": "7.75.0", "versionType": "semver"}, {"version": "7.74.0", "status": "affected", "lessThanOrEqual": "7.74.0", "versionType": "semver"}, {"version": "7.73.0", "status": "affected", "lessThanOrEqual": "7.73.0", "versionType": "semver"}, {"version": "7.72.0", "status": "affected", "lessThanOrEqual": "7.72.0", "versionType": "semver"}, {"version": "7.71.1", "status": "affected", "lessThanOrEqual": "7.71.1", "versionType": "semver"}, {"version": "7.71.0", "status": "affected", "lessThanOrEqual": "7.71.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-80231.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-80231.html", "name": "www"}, {"url": "https://hackerone.com/reports/3969368", "name": "issue"}], "credits": [{"lang": "en", "value": "Stanislav Fort (Aisle Research)", "type": "finder"}, {"lang": "en", "value": "Daniel Stenberg", "type": "remediation developer"}]}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "curl", "vendor": "curl", "versions": [{"lessThanOrEqual": "8.21.0", "status": "affected", "version": "8.21.0", "versionType": "semver"}, {"lessThanOrEqual": "8.20.0", "status": "affected", "version": "8.20.0", "versionType": "semver"}, {"lessThanOrEqual": "8.19.0", "status": "affected", "version": "8.19.0", "versionType": "semver"}, {"lessThanOrEqual": "8.18.0", "status": "affected", "version": "8.18.0", "versionType": "semver"}, {"lessThanOrEqual": "8.17.0", "status": "affected", "version": "8.17.0", "versionType": "semver"}, {"lessThanOrEqual": "8.16.0", "status": "affected", "version": "8.16.0", "versionType": "semver"}, {"lessThanOrEqual": "8.15.0", "status": "affected", "version": "8.15.0", "versionType": "semver"}, {"lessThanOrEqual": "8.14.1", "status": "affected", "version": "8.14.1", "versionType": "semver"}, {"lessThanOrEqual": "8.14.0", "status": "affected", "version": "8.14.0", "versionType": "semver"}, {"lessThanOrEqual": "8.13.0", "status": "affected", "version": "8.13.0", "versionType": "semver"}, {"lessThanOrEqual": "8.12.1", "status": "affected", "version": "8.12.1", "versionType": "semver"}, {"lessThanOrEqual": "8.12.0", "status": "affected", "version": "8.12.0", "versionType": "semver"}, {"lessThanOrEqual": "8.11.1", "status": "affected", "version": "8.11.1", "versionType": "semver"}, {"lessThanOrEqual": "8.11.0", "status": "affected", "version": "8.11.0", "versionType": "semver"}, {"lessThanOrEqual": "8.10.1", "status": "affected", "version": "8.10.1", "versionType": "semver"}, {"lessThanOrEqual": "8.10.0", "status": "affected", "version": "8.10.0", "versionType": "semver"}, {"lessThanOrEqual": "8.9.1", "status": "affected", "version": "8.9.1", "versionType": "semver"}, {"lessThanOrEqual": "8.9.0", "status": "affected", "version": "8.9.0", "versionType": "semver"}, {"lessThanOrEqual": "8.8.0", "status": "affected", "version": "8.8.0", "versionType": "semver"}, {"lessThanOrEqual": "8.7.1", "status": "affected", "version": "8.7.1", "versionType": "semver"}, {"lessThanOrEqual": "8.7.0", "status": "affected", "version": "8.7.0", "versionType": "semver"}, {"lessThanOrEqual": "8.6.0", "status": "affected", "version": "8.6.0", "versionType": "semver"}, {"lessThanOrEqual": "8.5.0", "status": "affected", "version": "8.5.0", "versionType": "semver"}, {"lessThanOrEqual": "8.4.0", "status": "affected", "version": "8.4.0", "versionType": "semver"}, {"lessThanOrEqual": "8.3.0", "status": "affected", "version": "8.3.0", "versionType": "semver"}, {"lessThanOrEqual": "8.2.1", "status": "affected", "version": "8.2.1", "versionType": "semver"}, {"lessThanOrEqual": "8.2.0", "status": "affected", "version": "8.2.0", "versionType": "semver"}, {"lessThanOrEqual": "8.1.2", "status": "affected", "version": "8.1.2", "versionType": "semver"}, {"lessThanOrEqual": "8.1.1", "status": "affected", "version": "8.1.1", "versionType": "semver"}, {"lessThanOrEqual": "8.1.0", "status": "affected", "version": "8.1.0", "versionType": "semver"}, {"lessThanOrEqual": "8.0.1", "status": "affected", "version": "8.0.1", "versionType": "semver"}, {"lessThanOrEqual": "8.0.0", "status": "affected", "version": "8.0.0", "versionType": "semver"}, {"lessThanOrEqual": "7.88.1", "status": "affected", "version": "7.88.1", "versionType": "semver"}, {"lessThanOrEqual": "7.88.0", "status": "affected", "version": "7.88.0", "versionType": "semver"}, {"lessThanOrEqual": "7.87.0", "status": "affected", "version": "7.87.0", "versionType": "semver"}, {"lessThanOrEqual": "7.86.0", "status": "affected", "version": "7.86.0", "versionType": "semver"}, {"lessThanOrEqual": "7.85.0", "status": "affected", "version": "7.85.0", "versionType": "semver"}, {"lessThanOrEqual": "7.84.0", "status": "affected", "version": "7.84.0", "versionType": "semver"}, {"lessThanOrEqual": "7.83.1", "status": "affected", "version": "7.83.1", "versionType": "semver"}, {"lessThanOrEqual": "7.83.0", "status": "affected", "version": "7.83.0", "versionType": "semver"}, {"lessThanOrEqual": "7.82.0", "status": "affected", "version": "7.82.0", "versionType": "semver"}, {"lessThanOrEqual": "7.81.0", "status": "affected", "version": "7.81.0", "versionType": "semver"}, {"lessThanOrEqual": "7.80.0", "status": "affected", "version": "7.80.0", "versionType": "semver"}, {"lessThanOrEqual": "7.79.1", "status": "affected", "version": "7.79.1", "versionType": "semver"}, {"lessThanOrEqual": "7.79.0", "status": "affected", "version": "7.79.0", "versionType": "semver"}, {"lessThanOrEqual": "7.78.0", "status": "affected", "version": "7.78.0", "versionType": "semver"}, {"lessThanOrEqual": "7.77.0", "status": "affected", "version": "7.77.0", "versionType": "semver"}, {"lessThanOrEqual": "7.76.1", "status": "affected", "version": "7.76.1", "versionType": "semver"}, {"lessThanOrEqual": "7.76.0", "status": "affected", "version": "7.76.0", "versionType": "semver"}, {"lessThanOrEqual": "7.75.0", "status": "affected", "version": "7.75.0", "versionType": "semver"}, {"lessThanOrEqual": "7.74.0", "status": "affected", "version": "7.74.0", "versionType": "semver"}, {"lessThanOrEqual": "7.73.0", "status": "affected", "version": "7.73.0", "versionType": "semver"}, {"lessThanOrEqual": "7.72.0", "status": "affected", "version": "7.72.0", "versionType": "semver"}, {"lessThanOrEqual": "7.71.1", "status": "affected", "version": "7.71.1", "versionType": "semver"}, {"lessThanOrEqual": "7.71.0", "status": "affected", "version": "7.71.0", "versionType": "semver"}]}], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup\nfor a given hostname even when using a different Native CA Store setting\n(`CURLSSLOPT_NATIVE_CA`) than when the connection was created."}], "id": "CVE-2026-80231", "lastModified": "2026-09-06T18:17:22.500", "metrics": {}, "published": "2026-09-06T18:17:22.500", "references": [{"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-80231.html"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-80231.json"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://hackerone.com/reports/3969368"}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9", "vulnStatus": "Received"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.21.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.20.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.19.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.18.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.17.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.16.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.15.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.14.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.14.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.13.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.12.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.12.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.11.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.11.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.10.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.10.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.9.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.9.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.8.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.7.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.7.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.6.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.5.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.4.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.3.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.2.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.1.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.1.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.1.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.0.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "8.0.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.88.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.88.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.87.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.86.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.85.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.84.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.83.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.83.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.82.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.81.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.80.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.79.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.79.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.78.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.77.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.76.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.76.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.75.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.74.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.73.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.72.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.71.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.71.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "curl", "source": "cna", "vendor": "curl"}, "product": "curl", "vendor": "curl"}], "created": "2026-09-06T19:30:11.522603+00:00", "title": "Improper HTTP Connection Reuse Allowing Certificate Validation Bypass in libcurl", "updated": "2026-09-06T20:30:04.622367+00:00", "vendors": ["curl", "curl$PRODUCT$curl"], "weaknesses": ["CWE-295"]}