https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-09T19:30:53.786751+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-53583 UBUNTU-CVE-2026-53583 2026-10-09T19:30:53.788497+00:00

Affected: Ubuntu:Pro:14.04:LTS: libgit2, Ubuntu:Pro:16.04:LTS: libgit2, Ubuntu:Pro:18.04:LTS: libgit2, Ubuntu:Pro:20.04:LTS: libgit2, Ubuntu:Pro:22.04:LTS: libgit2, Ubuntu:24.04:LTS: libgit2, Ubuntu:26.04:LTS: libgit2

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.