{"id":"CVE-2026-100408","published":"2026-11-04T15:17:21.997","lastModified":"2026-11-04T15:17:21.997","description":"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 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.","cvssScore":4.4,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","cwes":["CWE-787"],"vendors":[],"products":[],"references":[{"url":"https://github.com/git-for-windows/git/commit/b4d1fb62c7e2fdcab5a018e25e51acb196eb1756","tags":[]},{"url":"https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3","tags":[]},{"url":"https://github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2","tags":[]}],"exploitRefs":[{"url":"https://github.com/git-for-windows/git/commit/b4d1fb62c7e2fdcab5a018e25e51acb196eb1756","tags":[]},{"url":"https://github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3","tags":[]},{"url":"https://github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2","tags":[]}],"hasPoc":true,"ai":null}