PT-2026-26134 · Nghttp2 · Nghttp2

Published 2026-03-18 · Updated 2026-03-18 · CVE-2026-27135

Mitre

CVSS v3.1

7.5

High

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-27135

Affected Products

Nghttp2

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-27135 · Security Note
• https://github.com/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1 · Note
• https://github.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6 · Note