nghttp2 Denial of service: Assertion failure due to the missing state validation
Summary
| CVE | CVE-2026-27135 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-18 18:16:26 UTC |
| Updated | 2026-06-30 03:17:53 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.007750000 probability, percentile 0.512620000 (date 2026-07-02)
Problem Types: CWE-617 | CWE-617 CWE-617: Reachable Assertion | CWE-617 Reachable Assertion
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:14937 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27135.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8540 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8546 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8548 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7310 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1 | [email protected] | github.com | Patch |
| access.redhat.com/errata/RHSA-2026:25096 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16030 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14773 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7675 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8539 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16009 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11768 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7123 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20087 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:27201 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:17596 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19725 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15087 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8339 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7666 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7668 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16174 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9832 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9711 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10065 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7983 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16008 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7667 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7896 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21690 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7350 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13812 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21695 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8868 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7302 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8538 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/20/3 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:27200 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19724 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9874 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6 | [email protected] | github.com | Patch, Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:7670 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20040 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6190 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-27135 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21656 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| lists.debian.org/debian-lts-announce/2026/05/msg00025.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| access.redhat.com/errata/RHSA-2026:7080 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8545 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8547 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:8541 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-18T19:02:13.823Z | Reported to Red Hat. |
| ADP | 2026-03-18T17:59:02.045Z | Made public. |
Solutions
ADP: RHSA-2026:27200: Red Hat JBoss Core Services on RHEL 7 Server, Red Hat JBoss Core Services on RHEL 8
ADP: RHSA-2026:21695: Red Hat OpenShift Container Platform 4.12
ADP: RHSA-2026:13812: Middleware Containers for OpenShift
ADP: RHSA-2026:21690: Red Hat OpenShift Container Platform 4.13
ADP: RHSA-2026:15087: Red Hat OpenShift Container Platform 4.14
ADP: RHSA-2026:14773: Red Hat OpenShift Container Platform 4.15
ADP: RHSA-2026:20087: Red Hat OpenShift Container Platform 4.16
ADP: RHSA-2026:17596: Red Hat OpenShift Container Platform 4.17
ADP: RHSA-2026:21656: Red Hat OpenShift Container Platform 4.18
ADP: RHSA-2026:20040: Red Hat OpenShift Container Platform 4.19
ADP: 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)
ADP: RHSA-2026:7310: Red Hat Enterprise Linux AppStream EUS (v. 10.0)
ADP: 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)
ADP: RHSA-2026:7080: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:7675: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:8339: Red Hat Enterprise Linux AppStream (v. 8)
ADP: RHSA-2026:7123: Red Hat Enterprise Linux AppStream (v. 8)
ADP: RHSA-2026:7670: Red Hat Enterprise Linux AppStream (v. 8)
ADP: RHSA-2026:9711: Red Hat Enterprise Linux AppStream EUS (v.9.4)
ADP: RHSA-2026:9874: Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:7983: Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:7896: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:7302: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:7350: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:7667: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)
ADP: RHSA-2026:8541: Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
ADP: RHSA-2026:8539: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
ADP: RHSA-2026:8538: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6)
ADP: RHSA-2026:8540: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)
ADP: RHSA-2026:8546: Red Hat Enterprise Linux BaseOS E4S (v.9.0)
ADP: RHSA-2026:8545: Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:8547: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4)
ADP: RHSA-2026:8548: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)
ADP: RHSA-2026:7668: Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
ADP: RHSA-2026:25096: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:19724: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:19725: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:16008: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16030: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16009: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16174: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:14937: Red Hat Discovery 2
ADP: RHSA-2026:6190: Red Hat Hardened Images
ADP: RHSA-2026:9832: Red Hat Insights proxy 1.5
ADP: RHSA-2026:27201: Red Hat JBoss Core Services 2.4.62.SP4
ADP: RHSA-2026:11768: Red Hat Update Infrastructure 5
ADP: RHSA-2026:10065: Red Hat Update Infrastructure 5