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CVE-2026-27135

CVE-2026-27135 · nghttp2 Denial of service: Assertion failure due to the missing state validation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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.

CVSS 7.5 · High · EPSS 0.9% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • nghttp2

    Versions
    • < 1.68.1: Affected

    No fix published

  • nghttp2 Debian:12

    Versions
    • 1.52.0-1
    • 1.52.0-1+deb12u1
    • 1.52.0-1+deb12u2
    Affected ranges
    • ECOSYSTEM: < 1.52.0-1+deb12u3

    Update to 1.52.0-1+deb12u3

  • nghttp2 Debian:13

    Versions
    • 1.64.0-1.1
    Affected ranges
    • ECOSYSTEM: < 1.64.0-1.1+deb13u1

    Update to 1.64.0-1.1+deb13u1

  • nghttp2 Debian:14

    Versions
    • 1.64.0-1.1
    • 1.68.0-1
    • 1.68.0-2
    Affected ranges
    • ECOSYSTEM: < 1.68.1-1

    Update to 1.68.1-1

  • nghttp2 Ubuntu:Pro:16.04:LTS

    Versions
    • 0.6.7-1
    • 1.3.4-2
    • 1.4.0-1
    • 1.4.0-2
    • 1.5.0-2
    • 1.6.0-1
    • 1.7.0-1
    • 1.7.1-1
    • 1.7.1-1ubuntu0.1~esm1
    • 1.7.1-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: < 1.7.1-1ubuntu0.1~esm3

    Update to 1.7.1-1ubuntu0.1~esm3

  • nghttp2 Ubuntu:Pro:18.04:LTS

    Versions
    • 1.25.0-1
    • 1.27.0-1
    • 1.28.0-1
    • 1.29.0-1
    • 1.29.0-1build1
    • 1.30.0-1
    • 1.30.0-1ubuntu1
    • 1.30.0-1ubuntu1+esm1
    • 1.30.0-1ubuntu1+esm2
    Affected ranges
    • ECOSYSTEM: < 1.30.0-1ubuntu1+esm3

    Update to 1.30.0-1ubuntu1+esm3

  • nghttp2 Ubuntu:Pro:20.04:LTS

    Versions
    • 1.39.2-1
    • 1.40.0-1
    • 1.40.0-1build1
    • 1.40.0-1ubuntu0.1
    • 1.40.0-1ubuntu0.2
    • 1.40.0-1ubuntu0.3
    Affected ranges
    • ECOSYSTEM: < 1.40.0-1ubuntu0.3+esm1

    Update to 1.40.0-1ubuntu0.3+esm1

  • nghttp2 Ubuntu:22.04:LTS

    Versions
    • 1.43.0-1
    • 1.43.0-1build1
    • 1.43.0-1build2
    • 1.43.0-1build3
    • 1.43.0-1ubuntu0.1
    • 1.43.0-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 1.43.0-1ubuntu0.3

    Update to 1.43.0-1ubuntu0.3

  • nghttp2 Ubuntu:24.04:LTS

    Versions
    • 1.55.1-1
    • 1.57.0-1
    • 1.58.0-1
    • 1.59.0-1
    • 1.59.0-1build1
    • 1.59.0-1build2
    • 1.59.0-1build4
    • 1.59.0-1ubuntu0.1
    • 1.59.0-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 1.59.0-1ubuntu0.3

    Update to 1.59.0-1ubuntu0.3

  • nghttp2 Ubuntu:25.10

    Versions
    • 1.64.0-1ubuntu1
    • 1.64.0-1.1
    • 1.64.0-1.1build1
    • 1.64.0-1.1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 1.64.0-1.1ubuntu1.1

    Update to 1.64.0-1.1ubuntu1.1

  • nghttp2 Ubuntu:26.04:LTS

    Versions
    • 1.64.0-1.1ubuntu1
    • 1.64.0-1.1ubuntu2
    • 1.68.0-1
    • 1.68.0-2
    Affected ranges
    • ECOSYSTEM: < 1.68.0-2ubuntu0.1

    Update to 1.68.0-2ubuntu0.1

Original sources

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