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CVE-2026-53583 is an improper TLS certificate hostname validation vulnerability in libgit2's OpenSSL backend. In the IP-address SubjectAltName validation branch of the certificate-verification routine, an inverted memcmp result causes matching certificate IP SubjectAltNames to be rejected and mismatched IP SubjectAltNames to be accepted. The defect affects connections to HTTPS remotes specified using IP literals. DNS SubjectAltName validation and TLS backends other than OpenSSL are not affected. libgit2 versions before 1.8.6 and 1.9.5 are affected.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An inverted IP Subject Alternative Name comparison flaw in libgit2's OpenSSL backend.
A libgit2 vulnerability covered by Debian advisory DSA-6453 affecting Debian 13/libgit2 packages; the advisory states the issues could lead to arbitrary command execution on a remote SSH server, credential disclosure, denial of service, or directory creation outside a repository working tree.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.