{"schemaVersion":3,"id":"CVE-2026-53587","aliases":["RHSA-2026:67285","RHSA-2026:67286","RHSA-2026:69096","RHSA-2026:69097","RHSA-2026:69109","UBUNTU-CVE-2026-53587","DEBIAN-CVE-2026-53587"],"status":"published","duplicateOf":null,"title":null,"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 1.8.6 and 1.9.5, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. 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