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Improper Certificate Validation Affecting libgit2 package, versions *

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.24% (16th percentile)

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  • Snyk IDSNYK-DEBIAN12-LIBGIT2-18470441
  • published31 Jul 2026
  • disclosed20 Aug 2026
Report a new vulnerability Found a mistake?

Introduced: 31 Jul 2026

NewCVE-2026-53583  (opens in a new tab)
CWE-295  (opens in a new tab)
CWE-297  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 libgit2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libgit2 package and not the libgit2 package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.