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Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.0%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-27135
  • Nghttp2 » Nghttp2 » Version: 0.1.0
    cpe:2.3:a:nghttp2:nghttp2:0.1.0
  • Nghttp2 » Nghttp2 » Version: 0.2.0
    cpe:2.3:a:nghttp2:nghttp2:0.2.0
  • Nghttp2 » Nghttp2 » Version: 0.3.0
    cpe:2.3:a:nghttp2:nghttp2:0.3.0
  • Nghttp2 » Nghttp2 » Version: 0.3.1
    cpe:2.3:a:nghttp2:nghttp2:0.3.1
  • Nghttp2 » Nghttp2 » Version: 0.3.2
    cpe:2.3:a:nghttp2:nghttp2:0.3.2
  • Nghttp2 » Nghttp2 » Version: 0.4.0
    cpe:2.3:a:nghttp2:nghttp2:0.4.0
  • Nghttp2 » Nghttp2 » Version: 0.4.1
    cpe:2.3:a:nghttp2:nghttp2:0.4.1
  • Nghttp2 » Nghttp2 » Version: 0.5.0
    cpe:2.3:a:nghttp2:nghttp2:0.5.0
  • Nghttp2 » Nghttp2 » Version: 0.5.1
    cpe:2.3:a:nghttp2:nghttp2:0.5.1
  • Nghttp2 » Nghttp2 » Version: 0.6.0
    cpe:2.3:a:nghttp2:nghttp2:0.6.0
  • Nghttp2 » Nghttp2 » Version: 0.6.1
    cpe:2.3:a:nghttp2:nghttp2:0.6.1
  • Nghttp2 » Nghttp2 » Version: 0.6.2
    cpe:2.3:a:nghttp2:nghttp2:0.6.2
  • Nghttp2 » Nghttp2 » Version: 0.6.3
    cpe:2.3:a:nghttp2:nghttp2:0.6.3
  • Nghttp2 » Nghttp2 » Version: 0.6.4
    cpe:2.3:a:nghttp2:nghttp2:0.6.4
  • Nghttp2 » Nghttp2 » Version: 0.6.5
    cpe:2.3:a:nghttp2:nghttp2:0.6.5
  • Nghttp2 » Nghttp2 » Version: 0.6.6
    cpe:2.3:a:nghttp2:nghttp2:0.6.6
  • Nghttp2 » Nghttp2 » Version: 0.6.7
    cpe:2.3:a:nghttp2:nghttp2:0.6.7
  • Nghttp2 » Nghttp2 » Version: 0.7.0
    cpe:2.3:a:nghttp2:nghttp2:0.7.0
  • Nghttp2 » Nghttp2 » Version: 0.7.1
    cpe:2.3:a:nghttp2:nghttp2:0.7.1
  • Nghttp2 » Nghttp2 » Version: 0.7.10
    cpe:2.3:a:nghttp2:nghttp2:0.7.10
  • Nghttp2 » Nghttp2 » Version: 0.7.11
    cpe:2.3:a:nghttp2:nghttp2:0.7.11
  • Nghttp2 » Nghttp2 » Version: 0.7.12
    cpe:2.3:a:nghttp2:nghttp2:0.7.12
  • Nghttp2 » Nghttp2 » Version: 0.7.13
    cpe:2.3:a:nghttp2:nghttp2:0.7.13
  • Nghttp2 » Nghttp2 » Version: 0.7.14
    cpe:2.3:a:nghttp2:nghttp2:0.7.14
  • Nghttp2 » Nghttp2 » Version: 0.7.15
    cpe:2.3:a:nghttp2:nghttp2:0.7.15
  • Nghttp2 » Nghttp2 » Version: 0.7.2
    cpe:2.3:a:nghttp2:nghttp2:0.7.2
  • Nghttp2 » Nghttp2 » Version: 0.7.3
    cpe:2.3:a:nghttp2:nghttp2:0.7.3
  • Nghttp2 » Nghttp2 » Version: 0.7.4
    cpe:2.3:a:nghttp2:nghttp2:0.7.4
  • Nghttp2 » Nghttp2 » Version: 0.7.5
    cpe:2.3:a:nghttp2:nghttp2:0.7.5
  • Nghttp2 » Nghttp2 » Version: 0.7.6
    cpe:2.3:a:nghttp2:nghttp2:0.7.6
  • Nghttp2 » Nghttp2 » Version: 0.7.7
    cpe:2.3:a:nghttp2:nghttp2:0.7.7
  • Nghttp2 » Nghttp2 » Version: 0.7.8
    cpe:2.3:a:nghttp2:nghttp2:0.7.8
  • Nghttp2 » Nghttp2 » Version: 0.7.9
    cpe:2.3:a:nghttp2:nghttp2:0.7.9
  • Nghttp2 » Nghttp2 » Version: 1.0.0
    cpe:2.3:a:nghttp2:nghttp2:1.0.0
  • Nghttp2 » Nghttp2 » Version: 1.0.1
    cpe:2.3:a:nghttp2:nghttp2:1.0.1
  • Nghttp2 » Nghttp2 » Version: 1.0.2
    cpe:2.3:a:nghttp2:nghttp2:1.0.2
  • Nghttp2 » Nghttp2 » Version: 1.0.3
    cpe:2.3:a:nghttp2:nghttp2:1.0.3
  • Nghttp2 » Nghttp2 » Version: 1.0.4
    cpe:2.3:a:nghttp2:nghttp2:1.0.4
  • Nghttp2 » Nghttp2 » Version: 1.0.5
    cpe:2.3:a:nghttp2:nghttp2:1.0.5
  • Nghttp2 » Nghttp2 » Version: 1.1.0
    cpe:2.3:a:nghttp2:nghttp2:1.1.0
  • Nghttp2 » Nghttp2 » Version: 1.1.1
    cpe:2.3:a:nghttp2:nghttp2:1.1.1
  • Nghttp2 » Nghttp2 » Version: 1.1.2
    cpe:2.3:a:nghttp2:nghttp2:1.1.2
  • Nghttp2 » Nghttp2 » Version: 1.10.0
    cpe:2.3:a:nghttp2:nghttp2:1.10.0
  • Nghttp2 » Nghttp2 » Version: 1.11.0
    cpe:2.3:a:nghttp2:nghttp2:1.11.0
  • Nghttp2 » Nghttp2 » Version: 1.11.1
    cpe:2.3:a:nghttp2:nghttp2:1.11.1
  • Nghttp2 » Nghttp2 » Version: 1.12.0
    cpe:2.3:a:nghttp2:nghttp2:1.12.0
  • Nghttp2 » Nghttp2 » Version: 1.13.0
    cpe:2.3:a:nghttp2:nghttp2:1.13.0
  • Nghttp2 » Nghttp2 » Version: 1.14.0
    cpe:2.3:a:nghttp2:nghttp2:1.14.0
  • Nghttp2 » Nghttp2 » Version: 1.14.1
    cpe:2.3:a:nghttp2:nghttp2:1.14.1
  • Nghttp2 » Nghttp2 » Version: 1.15.0
    cpe:2.3:a:nghttp2:nghttp2:1.15.0
  • Nghttp2 » Nghttp2 » Version: 1.16.0
    cpe:2.3:a:nghttp2:nghttp2:1.16.0
  • Nghttp2 » Nghttp2 » Version: 1.16.1
    cpe:2.3:a:nghttp2:nghttp2:1.16.1
  • Nghttp2 » Nghttp2 » Version: 1.17.0
    cpe:2.3:a:nghttp2:nghttp2:1.17.0
  • Nghttp2 » Nghttp2 » Version: 1.18.0
    cpe:2.3:a:nghttp2:nghttp2:1.18.0
  • Nghttp2 » Nghttp2 » Version: 1.18.1
    cpe:2.3:a:nghttp2:nghttp2:1.18.1
  • Nghttp2 » Nghttp2 » Version: 1.19.0
    cpe:2.3:a:nghttp2:nghttp2:1.19.0
  • Nghttp2 » Nghttp2 » Version: 1.2.0
    cpe:2.3:a:nghttp2:nghttp2:1.2.0
  • Nghttp2 » Nghttp2 » Version: 1.2.1
    cpe:2.3:a:nghttp2:nghttp2:1.2.1
  • Nghttp2 » Nghttp2 » Version: 1.20.0
    cpe:2.3:a:nghttp2:nghttp2:1.20.0
  • Nghttp2 » Nghttp2 » Version: 1.21.0
    cpe:2.3:a:nghttp2:nghttp2:1.21.0
  • Nghttp2 » Nghttp2 » Version: 1.21.1
    cpe:2.3:a:nghttp2:nghttp2:1.21.1
  • Nghttp2 » Nghttp2 » Version: 1.22.0
    cpe:2.3:a:nghttp2:nghttp2:1.22.0
  • Nghttp2 » Nghttp2 » Version: 1.23.0
    cpe:2.3:a:nghttp2:nghttp2:1.23.0
  • Nghttp2 » Nghttp2 » Version: 1.23.1
    cpe:2.3:a:nghttp2:nghttp2:1.23.1
  • Nghttp2 » Nghttp2 » Version: 1.24.0
    cpe:2.3:a:nghttp2:nghttp2:1.24.0
  • Nghttp2 » Nghttp2 » Version: 1.25.0
    cpe:2.3:a:nghttp2:nghttp2:1.25.0
  • Nghttp2 » Nghttp2 » Version: 1.26.0
    cpe:2.3:a:nghttp2:nghttp2:1.26.0
  • Nghttp2 » Nghttp2 » Version: 1.27.0
    cpe:2.3:a:nghttp2:nghttp2:1.27.0
  • Nghttp2 » Nghttp2 » Version: 1.28.0
    cpe:2.3:a:nghttp2:nghttp2:1.28.0
  • Nghttp2 » Nghttp2 » Version: 1.29.0
    cpe:2.3:a:nghttp2:nghttp2:1.29.0
  • Nghttp2 » Nghttp2 » Version: 1.3.0
    cpe:2.3:a:nghttp2:nghttp2:1.3.0
  • Nghttp2 » Nghttp2 » Version: 1.3.1
    cpe:2.3:a:nghttp2:nghttp2:1.3.1
  • Nghttp2 » Nghttp2 » Version: 1.3.2
    cpe:2.3:a:nghttp2:nghttp2:1.3.2
  • Nghttp2 » Nghttp2 » Version: 1.3.3
    cpe:2.3:a:nghttp2:nghttp2:1.3.3
  • Nghttp2 » Nghttp2 » Version: 1.3.4
    cpe:2.3:a:nghttp2:nghttp2:1.3.4
  • Nghttp2 » Nghttp2 » Version: 1.30.0
    cpe:2.3:a:nghttp2:nghttp2:1.30.0
  • Nghttp2 » Nghttp2 » Version: 1.31.0
    cpe:2.3:a:nghttp2:nghttp2:1.31.0
  • Nghttp2 » Nghttp2 » Version: 1.31.1
    cpe:2.3:a:nghttp2:nghttp2:1.31.1
  • Nghttp2 » Nghttp2 » Version: 1.32.0
    cpe:2.3:a:nghttp2:nghttp2:1.32.0
  • Nghttp2 » Nghttp2 » Version: 1.32.1
    cpe:2.3:a:nghttp2:nghttp2:1.32.1
  • Nghttp2 » Nghttp2 » Version: 1.33.0
    cpe:2.3:a:nghttp2:nghttp2:1.33.0
  • Nghttp2 » Nghttp2 » Version: 1.34.0
    cpe:2.3:a:nghttp2:nghttp2:1.34.0
  • Nghttp2 » Nghttp2 » Version: 1.35.0
    cpe:2.3:a:nghttp2:nghttp2:1.35.0
  • Nghttp2 » Nghttp2 » Version: 1.35.1
    cpe:2.3:a:nghttp2:nghttp2:1.35.1
  • Nghttp2 » Nghttp2 » Version: 1.36.0
    cpe:2.3:a:nghttp2:nghttp2:1.36.0
  • Nghttp2 » Nghttp2 » Version: 1.37.0
    cpe:2.3:a:nghttp2:nghttp2:1.37.0
  • Nghttp2 » Nghttp2 » Version: 1.38.0
    cpe:2.3:a:nghttp2:nghttp2:1.38.0
  • Nghttp2 » Nghttp2 » Version: 1.39.0
    cpe:2.3:a:nghttp2:nghttp2:1.39.0
  • Nghttp2 » Nghttp2 » Version: 1.39.1
    cpe:2.3:a:nghttp2:nghttp2:1.39.1
  • Nghttp2 » Nghttp2 » Version: 1.39.2
    cpe:2.3:a:nghttp2:nghttp2:1.39.2
  • Nghttp2 » Nghttp2 » Version: 1.4.0
    cpe:2.3:a:nghttp2:nghttp2:1.4.0
  • Nghttp2 » Nghttp2 » Version: 1.40.0
    cpe:2.3:a:nghttp2:nghttp2:1.40.0
  • Nghttp2 » Nghttp2 » Version: 1.41.0
    cpe:2.3:a:nghttp2:nghttp2:1.41.0
  • Nghttp2 » Nghttp2 » Version: 1.42.0
    cpe:2.3:a:nghttp2:nghttp2:1.42.0
  • Nghttp2 » Nghttp2 » Version: 1.43.0
    cpe:2.3:a:nghttp2:nghttp2:1.43.0
  • Nghttp2 » Nghttp2 » Version: 1.44.0
    cpe:2.3:a:nghttp2:nghttp2:1.44.0
  • Nghttp2 » Nghttp2 » Version: 1.45.0
    cpe:2.3:a:nghttp2:nghttp2:1.45.0
  • Nghttp2 » Nghttp2 » Version: 1.45.1
    cpe:2.3:a:nghttp2:nghttp2:1.45.1
  • Nghttp2 » Nghttp2 » Version: 1.46.0
    cpe:2.3:a:nghttp2:nghttp2:1.46.0
  • Nghttp2 » Nghttp2 » Version: 1.47.0
    cpe:2.3:a:nghttp2:nghttp2:1.47.0
  • Nghttp2 » Nghttp2 » Version: 1.48.0
    cpe:2.3:a:nghttp2:nghttp2:1.48.0
  • Nghttp2 » Nghttp2 » Version: 1.49.0
    cpe:2.3:a:nghttp2:nghttp2:1.49.0
  • Nghttp2 » Nghttp2 » Version: 1.5.0
    cpe:2.3:a:nghttp2:nghttp2:1.5.0
  • Nghttp2 » Nghttp2 » Version: 1.50.0
    cpe:2.3:a:nghttp2:nghttp2:1.50.0
  • Nghttp2 » Nghttp2 » Version: 1.51.0
    cpe:2.3:a:nghttp2:nghttp2:1.51.0
  • Nghttp2 » Nghttp2 » Version: 1.52.0
    cpe:2.3:a:nghttp2:nghttp2:1.52.0
  • Nghttp2 » Nghttp2 » Version: 1.53.0
    cpe:2.3:a:nghttp2:nghttp2:1.53.0
  • Nghttp2 » Nghttp2 » Version: 1.54.0
    cpe:2.3:a:nghttp2:nghttp2:1.54.0
  • Nghttp2 » Nghttp2 » Version: 1.55.0
    cpe:2.3:a:nghttp2:nghttp2:1.55.0
  • Nghttp2 » Nghttp2 » Version: 1.55.1
    cpe:2.3:a:nghttp2:nghttp2:1.55.1
  • Nghttp2 » Nghttp2 » Version: 1.56.0
    cpe:2.3:a:nghttp2:nghttp2:1.56.0
  • Nghttp2 » Nghttp2 » Version: 1.57.0
    cpe:2.3:a:nghttp2:nghttp2:1.57.0
  • Nghttp2 » Nghttp2 » Version: 1.6.0
    cpe:2.3:a:nghttp2:nghttp2:1.6.0
  • Nghttp2 » Nghttp2 » Version: 1.61.0
    cpe:2.3:a:nghttp2:nghttp2:1.61.0
  • Nghttp2 » Nghttp2 » Version: 1.7.0
    cpe:2.3:a:nghttp2:nghttp2:1.7.0
  • Nghttp2 » Nghttp2 » Version: 1.7.1
    cpe:2.3:a:nghttp2:nghttp2:1.7.1
  • Nghttp2 » Nghttp2 » Version: 1.8.0
    cpe:2.3:a:nghttp2:nghttp2:1.8.0
  • Nghttp2 » Nghttp2 » Version: 1.9.0
    cpe:2.3:a:nghttp2:nghttp2:1.9.0
  • Nghttp2 » Nghttp2 » Version: 1.9.1
    cpe:2.3:a:nghttp2:nghttp2:1.9.1
  • Nghttp2 » Nghttp2 » Version: 1.9.2
    cpe:2.3:a:nghttp2:nghttp2:1.9.2


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