http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.
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Fixes

Solution

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Workaround

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History

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.
Title http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard
First Time appeared Http-cache-semantics Project
Http-cache-semantics Project http-cache-semantics
Weaknesses CWE-436
CPEs cpe:2.3:a:http-cache-semantics_project:http-cache-semantics:*:*:*:*:*:*:*:*
Vendors & Products Http-cache-semantics Project
Http-cache-semantics Project http-cache-semantics
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-18T18:03:20.270Z

Reserved: 2026-09-18T16:30:17.776Z

Link: CVE-2026-93750

cve-icon Vulnrichment

Updated: 2026-09-18T18:03:16.325Z

cve-icon NVD

Status : Received

Published: 2026-09-18T18:18:33.633

Modified: 2026-09-18T18:18:33.633

Link: CVE-2026-93750

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses