{"id":"CVE-2026-100408","title":"Git for Windows: git-credential-wincred Erase Path Heap Overflow","summary":"Git for Windows is the Windows port of Git. From 2.43.0.windows.1 until 2.55.0.windows.3, when a matching git:* credential exists in Windows Credential Manager and a git-credential-wincred erase input includes a password field, the opera…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","cvssSource":"cna","cwe":["CWE-787"],"vendor":"git-for-windows","product":"git","affected":["git >= 2.43.0.windows.1, < 2.55.0.windows.3"],"published":"2026-11-04","updated":"2026-11-04","sourceUpdated":"2026-11-04T15:12:10.794Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-100408","references":[{"url":"https://github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2","label":"https://github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2"},{"url":"https://github.com/git-for-windows/git/commit/b4d1fb62c7e2fdcab5a018e25e51acb196eb1756","label":"https://github.com/git-for-windows/git/commit/b4d1fb62c7e2fdcab5a018e25e51acb196eb1756"},{"url":"https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3","label":"https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T21:36:00.403Z","slug":"CVE-2026-100408","body":"## Overview\n\nGit for Windows is the Windows port of Git. From 2.43.0.windows.1 until 2.55.0.windows.3, when a matching git:* credential exists in Windows Credential Manager and a git-credential-wincred erase input includes a password field, the operation in contrib/credential/wincred/git-credential-wincred.c allocates a buffer of exactly CredentialBlobSize bytes in match_cred_password() and then uses wcsncpy_s() to copy the corresponding number of wide characters plus a terminating NUL. The destination capacity is also supplied in bytes instead of WCHAR elements, allowing a fixed two-byte NUL write past the allocation before the password comparison determines whether CredDeleteW() should remove the credential; erase without a password field does not enter this comparison path. The helper can terminate with Windows heap-corruption status, and git credential reject can appear successful while the rejected credential remains stored. This issue is fixed in version 2.55.0.windows.3.\n\n## Affected\n\n- `git >= 2.43.0.windows.1, < 2.55.0.windows.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}