Buffer overflow in Git-For-Windows Git
CVE-2026-100407
Git for Windows is the Windows port of Git. From 2.44.0.windows.1 until 2.55.0.windows.3, the git-credential-wincred store operation in contrib/credential/wincred/git-credential-wincred.c uses _scwprintf() to size a formatted wide-character credential buffer without space for the terminating NUL when both password and oauth_refresh_token are present. The operation also passes a byte count to _snwprintf_s() where a wide-character count is required, allowing the terminator to be written one WCHAR past the heap allocation before CredWriteW() persists the credential. The resulting fixed two-byte NUL overwrite can terminate the helper with Windows heap-corruption status and can cause git credential approve to report success even though the OAuth credential was not stored. This issue is fixed in version 2.55.0.windows.3.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Git-For-Windows Git — versions >= 2.44.0.windows.1, < 2.55.0.windows.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-100407?
- CVE-2026-100407 is a medium-severity vulnerability in Git-For-Windows Git, classified under Out-of-bounds Write. CVSS score: 4.4/10. Published 2026-11-04.
- How severe is CVE-2026-100407?
- Medium severity. CVSS v3 base score is 4.4 out of 10.