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CVE-2026-27135 Not scored

nghttp2 Denial of service: Assertion failure due to the missing state validation

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.

Exploit probability 0.8%
Published March 18, 2026
Required by Not available
Last source change July 22, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

113 explicit affected versions

03 / CONNECTIONS

Connected vulnerabilities

related ALSA-2026:7080
related ALSA-2026:7123
related ALSA-2026:7350
related ALSA-2026:7666
related ALSA-2026:7667
related ALSA-2026:7668
related ALSA-2026:7670
related ALSA-2026:7675
related ALSA-2026:7896
related ALSA-2026:8339
related OPENSUSE-SU-2026:10437-1
related OPENSUSE-SU-2026:20413-1
related SUSE-SU-2026:1056-1
related SUSE-SU-2026:1074-1
related SUSE-SU-2026:1247-1
related SUSE-SU-2026:1350-1
related SUSE-SU-2026:20833-1
related SUSE-SU-2026:20870-1
related SUSE-SU-2026:20925-1
related SUSE-SU-2026:20950-1

04 / EVIDENCE

Source records

Open Source Vulnerabilities CVE-2026-27135

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.

View original source

05 / REFERENCES

Further evidence