{"id":"UBUNTU-CVE-2026-73621","details":"GitPython before 3.1.56 contains an argument injection vulnerability in the Commit.count() method, which forwards keyword arguments to 'git rev-list' without the check_unsafe_options guard present in the sibling iter_items method. An attacker who can control options passed to Commit.count (e.g., via an application that forwards a user-supplied options dict) can supply output=\u003cpath\u003e, causing 'git rev-list --output=\u003cpath\u003e' to open and truncate the target file to zero bytes before revision parsing. This allows destruction/blanking of an arbitrary file at the process's privilege level (no content control, 0-byte truncation).","modified":"2026-08-19T11:11:14Z","published":"2026-08-13T12:17:00Z","upstream":["CVE-2026-73621"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-73621"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-73621"},{"type":"REPORT","url":"https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count"}],"affected":[{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3.2~RC1-2","0.3.2~RC1-3","0.3.2~RC1-3ubuntu0.1~esm1","0.3.2~RC1-3ubuntu0.1~esm2","0.3.2~RC1-3ubuntu0.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"python-git","binary_version":"0.3.2~RC1-3ubuntu0.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.1+git137-gc8b8379-1","1.0.1+git137-gc8b8379-2","1.0.1+git137-gc8b8379-2.1","1.0.1+git137-gc8b8379-2.1ubuntu0.1~esm1","1.0.1+git137-gc8b8379-2.1ubuntu0.1~esm2","1.0.1+git137-gc8b8379-2.1ubuntu0.1~esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"python-git","binary_version":"1.0.1+git137-gc8b8379-2.1ubuntu0.1~esm4"},{"binary_name":"python3-git","binary_version":"1.0.1+git137-gc8b8379-2.1ubuntu0.1~esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.5-1","2.1.6-1","2.1.7-1","2.1.8-1","2.1.8-1ubuntu0.1~esm1","2.1.8-1ubuntu0.1~esm2","2.1.8-1ubuntu0.1~esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"python-git","binary_version":"2.1.8-1ubuntu0.1~esm4"},{"binary_name":"python3-git","binary_version":"2.1.8-1ubuntu0.1~esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.11-1","3.0.4-1","3.0.5-1","3.0.7-1","3.0.7-1ubuntu0.1~esm1","3.0.7-1ubuntu0.1~esm2","3.0.7-1ubuntu0.1~esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.7-1ubuntu0.1~esm4","binary_name":"python3-git"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.14-1","3.1.23-1","3.1.24-1","3.1.24-1ubuntu0.1~esm1","3.1.24-1ubuntu0.1~esm2","3.1.24-1ubuntu0.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.24-1ubuntu0.1~esm3","binary_name":"python3-git"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.30-1","3.1.37-1","3.1.37-3","3.1.37-3ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-git","binary_version":"3.1.37-3ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}},{"package":{"name":"python-git","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/python-git?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.44-1","3.1.45-1","3.1.46-1","3.1.46-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-git","binary_version":"3.1.46-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73621.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}