CVE-2026-53583 - libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend
Brief
CVE ID : CVE-2026-53583
Published : Aug. 20, 2026, 6:39 p. m.
- 30 minutes ago
Description : 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.
- 6 and 1.
- 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.
- 6 and 1.
- 5.