---
id: CVE-2026-100407
title: 'Git for Windows: git-credential-wincred OAuth Store Heap Overflow'
summary: >-
  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-charac…
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 >= 2.44.0.windows.1, < 2.55.0.windows.3'
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T20:41:14.929892Z'
exploitAvailable: true
published: '2026-11-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:07:18.059Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-100407'
references:
  - url: >-
      https://github.com/git-for-windows/git/security/advisories/GHSA-v3h4-vrpr-rh9x
    label: >-
      https://github.com/git-for-windows/git/security/advisories/GHSA-v3h4-vrpr-rh9x
  - url: >-
      https://github.com/git-for-windows/git/commit/52ca1113d651127f89477a8763f86ab20f645e1d
    label: >-
      https://github.com/git-for-windows/git/commit/52ca1113d651127f89477a8763f86ab20f645e1d
  - 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
  - exploit-available
epss: 0.00117
epssPercentile: 0.01661
ingestedAt: '2026-11-05T22:38:31.507Z'
---

## Overview

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.

## Affected

- `git >= 2.44.0.windows.1, < 2.55.0.windows.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.