{"id":"PYSEC-2026-3947","details":"GitPython 3.1.50 fails to recognize joined short-option forms such as -u\u003cvalue\u003e (the short form of --upload-pack=\u003cvalue\u003e) when enforcing its default unsafe-option gate. When an application passes attacker-influenced clone options into Repo.clone_from(..., multi_options=..., allow_unsafe_options=False), an attacker can supply -u\u003chelper\u003e to bypass the gate that blocks --upload-pack/-u, causing Git to execute the specified helper command during clone. Fixed in 3.1.51.","aliases":["CVE-2026-67324","GHSA-v396-v7q4-x2qj"],"modified":"2026-09-11T13:45:02.949863536Z","published":"2026-08-01T13:17:02.770Z","references":[{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/gitpython-authentication-bypass-via-joined-short-options"},{"type":"EVIDENCE","url":"https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v396-v7q4-x2qj"}],"affected":[{"package":{"name":"gitpython","ecosystem":"PyPI","purl":"pkg:pypi/gitpython"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.50"},{"fixed":"3.1.51"}]}],"versions":["3.1.50"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/gitpython/PYSEC-2026-3947.yaml"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}