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alsa-2026:7666
Vulnerability from osv_almalinux
Published
2026-04-13 00:00
Modified
2026-04-15 07:43
Summary
Important: nghttp2 security update
Details
libnghttp2 is a library implementing the Hypertext Transfer Protocol version 2 (HTTP/2) protocol in C.
Security Fix(es):
- nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
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"id": "ALSA-2026:7666",
"modified": "2026-04-15T07:43:49Z",
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CVE-2026-27135 (GCVE-0-2026-27135)
Vulnerability from cvelistv5 – Published: 2026-03-18 17:59 – Updated: 2026-06-30 12:08
VLAI
EPSS
Title
nghttp2 Denial of service: Assertion failure due to the missing state validation
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-617 - Reachable Assertion
Assigner
References
54 references
Impacted products
47 products
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{
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{
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{
"lang": "en",
"value": "RHSA-2026:27200: Red Hat JBoss Core Services on RHEL 7 Server, Red Hat JBoss Core Services on RHEL 8"
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{
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"value": "RHSA-2026:21695: Red Hat OpenShift Container Platform 4.12"
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{
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{
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{
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"value": "RHSA-2026:15087: Red Hat OpenShift Container Platform 4.14"
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"value": "RHSA-2026:14773: Red Hat OpenShift Container Platform 4.15"
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{
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{
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"value": "RHSA-2026:21656: Red Hat OpenShift Container Platform 4.18"
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{
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"value": "RHSA-2026:20040: Red Hat OpenShift Container Platform 4.19"
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{
"lang": "en",
"value": "RHSA-2026:8868: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)"
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{
"lang": "en",
"value": "RHSA-2026:7310: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"
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{
"lang": "en",
"value": "RHSA-2026:7666: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"
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{
"lang": "en",
"value": "RHSA-2026:7080: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:7675: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:8339: Red Hat Enterprise Linux AppStream (v. 8)"
},
{
"lang": "en",
"value": "RHSA-2026:7123: Red Hat Enterprise Linux AppStream (v. 8)"
},
{
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"value": "RHSA-2026:7670: Red Hat Enterprise Linux AppStream (v. 8)"
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"value": "RHSA-2026:9711: Red Hat Enterprise Linux AppStream EUS (v.9.4)"
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"value": "RHSA-2026:7896: Red Hat Enterprise Linux AppStream (v. 9)"
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"value": "RHSA-2026:7350: Red Hat Enterprise Linux AppStream (v. 9)"
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"value": "RHSA-2026:7667: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)"
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{
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"value": "RHSA-2026:8541: Red Hat Enterprise Linux BaseOS AUS (v. 8.2)"
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"value": "RHSA-2026:8539: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)"
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},
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"lang": "en",
"value": "RHSA-2026:8540: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)"
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{
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"value": "RHSA-2026:8546: Red Hat Enterprise Linux BaseOS E4S (v.9.0)"
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{
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"value": "RHSA-2026:8545: Red Hat Enterprise Linux BaseOS E4S (v.9.2)"
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"value": "RHSA-2026:8547: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4)"
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{
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"value": "RHSA-2026:8548: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)"
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{
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"value": "RHSA-2026:7668: Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"
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{
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"value": "RHSA-2026:25096: Red Hat AI Inference Server 3.2"
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{
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"value": "RHSA-2026:19724: Red Hat AI Inference Server 3.2"
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{
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"value": "RHSA-2026:19725: Red Hat AI Inference Server 3.2"
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{
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"value": "RHSA-2026:16008: Red Hat AI Inference Server 3.3"
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{
"lang": "en",
"value": "RHSA-2026:16030: Red Hat AI Inference Server 3.3"
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{
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"value": "RHSA-2026:16009: Red Hat AI Inference Server 3.3"
},
{
"lang": "en",
"value": "RHSA-2026:16174: Red Hat AI Inference Server 3.3"
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{
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"value": "RHSA-2026:14937: Red Hat Discovery 2"
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{
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"value": "RHSA-2026:6190: Red Hat Hardened Images"
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{
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"value": "RHSA-2026:9832: Red Hat Insights proxy 1.5"
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{
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{
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"value": "RHSA-2026:11768: Red Hat Update Infrastructure 5"
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{
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"timeline": [
{
"lang": "en",
"time": "2026-03-18T19:02:13.823Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-03-18T17:59:02.045Z",
"value": "Made public."
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],
"title": "nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination",
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],
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"vendor": "nghttp2",
"versions": [
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}
]
}
],
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"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."
}
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"metrics": [
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"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",
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}
}
],
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"descriptions": [
{
"cweId": "CWE-617",
"description": "CWE-617: Reachable Assertion",
"lang": "en",
"type": "CWE"
}
]
}
],
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"shortName": "GitHub_M"
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"name": "https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6",
"tags": [
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],
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},
{
"name": "https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1",
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],
"source": {
"advisory": "GHSA-6933-cjhr-5qg6",
"discovery": "UNKNOWN"
},
"title": "nghttp2 Denial of service: Assertion failure due to the missing state validation"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27135",
"datePublished": "2026-03-18T17:59:02.045Z",
"dateReserved": "2026-02-17T18:42:27.044Z",
"dateUpdated": "2026-06-30T12:08:08.741Z",
"state": "PUBLISHED"
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}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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