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libgit2

A vulnerability in libgit2 prior to versions 1.8.6 and 1.9.5 causes incorrect validation of IP-literal HTTPS URLs when using OpenSSL. This flaw allows a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept connections. The issue affects only OpenSSL builds and does not impact DNS SubjectAltName validation or other TLS backends. The vulnerability is fixed in libgit2 versions 1.8.6 and 1.9.5. Red Hat has released updated packages including libgit2-1.9.7-1.hum1 to address this issue.

The vulnerability identified as CVE-2026-53583 affects libgit2 versions prior to 1.8.6 and 1.9.5. It involves incorrect validation of IP-literal HTTPS URLs when using OpenSSL as the TLS backend. This validation flaw allows a network attacker who possesses a CA-trusted certificate with any IP SubjectAltName to intercept TLS connections, effectively undermining the security of the connection. The flaw does not affect DNS SubjectAltName validation or other TLS backends besides OpenSSL. Red Hat has issued a security advisory and released updated libgit2 packages (version 1.9.7-1.hum1) to fix this vulnerability.

Detailed information about Libgit2: [Unknown description] (CVE-2026-53583) affecting null libgit2. Get real-time updates, technical details, and mitigation stra

Libgit2: [Unknown description] (CVE-2026-53583) - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:59361

https://images.redhat.com/

https://access.redhat.com/security/cve/CVE-2026-53587

https://access.redhat.com/security/updates/classification/

https://access.redhat.com/security/cve/CVE-2026-53586

https://access.redhat.com/security/cve/CVE-2026-53584

https://access.redhat.com/security/cve/CVE-2026-53585

https://access.redhat.com/security/cve/CVE-2026-53583

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SUSE CVE CVE-2026-53583 page

SUSE CVE CVE-2026-53584 page

SUSE CVE CVE-2026-53585 page

SUSE CVE CVE-2026-53586 page

SUSE CVE CVE-2026-53587 page

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

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