{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27135", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-17T18:42:27.044Z", "datePublished": "2026-03-18T17:59:02.045Z", "dateUpdated": "2026-07-15T01:14:36.116Z"}, "containers": {"cna": {"title": "nghttp2 Denial of service: Assertion failure due to the missing state validation", "problemTypes": [{"descriptions": [{"cweId": "CWE-617", "lang": "en", "description": "CWE-617: Reachable Assertion", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6"}, {"name": "https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1", "tags": ["x_refsource_MISC"], "url": "https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1"}], "affected": [{"vendor": "nghttp2", "product": "nghttp2", "versions": [{"version": "< 1.68.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-18T17:59:02.045Z"}, "descriptions": [{"lang": "en", "value": "nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available."}], "source": {"advisory": "GHSA-6933-cjhr-5qg6", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-18T18:36:41.841104Z", "id": "CVE-2026-27135", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-18T18:36:48.198Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/20/3"}, {"url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00025.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-13T21:31:25.337Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": 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Due to missing internal state validation, the library continues to process incoming data even after a session has been terminated. A remote attacker could exploit this by sending a specially crafted HTTP/2 frame, leading to an assertion failure and a denial of service (DoS)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-617", "description": "Reachable Assertion"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-06-30T12:08:08.741Z"}}, {"affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "x_adpType": "supplier", "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}], "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:47:22.165Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-27135", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-18T18:36:41.841104Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-18T18:36:44.358Z"}}], "cna": {"title": "nghttp2 Denial of service: Assertion failure due to the missing state validation", "source": {"advisory": "GHSA-6933-cjhr-5qg6", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "nghttp2", "product": "nghttp2", "versions": [{"status": "affected", "version": "< 1.68.1"}]}], "references": [{"url": "https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6", "name": "https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1", "name": "https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. 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Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available."}, {"lang": "es", "value": "nghttp2 es una implementaci\u00f3n del Protocolo de Transferencia de Hipertexto versi\u00f3n 2 en C. Antes de la versi\u00f3n 1.68.1, la biblioteca nghttp2 deja de leer los datos entrantes cuando la aplicaci\u00f3n llama a la API p\u00fablica orientada al usuario 'nghttp2_session_terminate_session' o 'nghttp2_session_terminate_session2'. Estas pueden ser llamadas internamente por la biblioteca cuando esta detecta una situaci\u00f3n sujeta a error de conexi\u00f3n. Debido a la falta de validaci\u00f3n del estado interno, la biblioteca sigue leyendo el resto de los datos despu\u00e9s de que se llama a una de esas APIs. Luego, recibir una trama malformada que causa FRAME_SIZE_ERROR provoca un fallo de aserci\u00f3n. nghttp2 v1.68.1 a\u00f1ade la validaci\u00f3n de estado faltante para evitar el fallo de aserci\u00f3n. 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{"bugzilla": {"description": "nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination", "id": "2448754", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448754"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["A flaw was found in nghttp2. Due to missing internal state validation, the library continues to process incoming data even after a session has been terminated. A remote attacker could exploit this by sending a specially crafted HTTP/2 frame, leading to an assertion failure and a denial of service (DoS)."], "name": "CVE-2026-27135", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nghttp2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nodejs22", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "nodejs24", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nghttp2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nghttp2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "nghttp2", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-18T17:59:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27135\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27135\nhttps://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1\nhttps://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.68.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "nghttp2", "source": "cna", "vendor": "nghttp2"}, "product": "nghttp2", "vendor": "nghttp2"}], "analysis": {"en": {"generated_at": "2026-03-23T19:35:44.199672+00:00", "value": {"mitigation_remediation": ["Upgrade nghttp2 to version 1.68.1 or later"], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the nghttp2 implementation of HTTP/2, specifically all releases prior to version\u202f1.68.1. Any deployment that relies on nghttp2\u202f1.68.0 or earlier is exposed. The products involved are the nghttp2 library exposed through its public APIs nghttp2_session_terminate_session and nghttp2_session_terminate_session2.", "description_and_impact": "nghttp2 contains an assertion failure vulnerability caused by missing internal state validation after the library\u2019s session termination API is invoked. This flaw permits an attacker to send a crafted HTTP/2 frame that triggers a FRAME_SIZE_ERROR condition, ultimately leading the library to assert and crash. The root weakness is improper input validation, classified as CWE\u2011617. When triggered, the service using nghttp2 experiences a denial of service because the thread or process handling the connection terminates unexpectedly.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high impact on availability. Although the EPSS probability is low (<1\u202f%) and the issue is not listed in the CISA KEV catalog, the potential for denial of service remains significant for services that have no fail\u2011over or do not handle unexpected crashes gracefully. The absence of a workaround means the only defense is to update to a version that includes the missing state validation, namely 1.68.1 or later. Attackers would need network access to target the application using nghttp2; once they send the malformed frame, the session terminates and the application cannot recover until restarted."}}}}, "created": "2026-03-19T08:55:47.067485+00:00", "updated": "2026-03-24T10:58:04.724588+00:00", "vendors": ["nghttp2", "nghttp2$PRODUCT$nghttp2"]}