CVE-2026-100407

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 34/100

Published: 2026-11-04 Modified: 2026-11-05 First seen: 2026-11-04 Status: active

Attack Surface

Low Complexity No Auth

CVSS Vector Breakdown

AV: Local

AC: Low

PR: None

UI: Required

S: Unchanged

C: None

I: Low

A: Low

Description

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.