git-for-windows Git 2.53.0(2) wincred git-credential-wincred.c store password/oauth_refresh_token buffer overflow

Summaryinfo

A vulnerability, which was classified as problematic, was found in git-for-windows Git. This vulnerability affects the function store of the file contrib/credential/wincred/git-credential-wincred.c of the component wincred. Executing a manipulation of the argument password/oauth_refresh_token can lead to buffer overflow. The identification of this vulnerability is CVE-2026-100407. The attack can only be executed locally. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in git-for-windows Git and classified as problematic. This vulnerability affects the function store of the file contrib/credential/wincred/git-credential-wincred.c of the component wincred. The manipulation of the argument password/oauth_refresh_token with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-100407 since 09/25/2026. The exploitation appears to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 2.55.0.windows.3 eliminates this vulnerability.

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Productinfo

Type

• Versioning Software

Vendor

• git-for-windows

Name

• Git

Version

• 2.53.0(2)

License

• open-source

Website

• Product: https://github.com/git-for-windows/git/

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