Git for Windows: git-credential-wincred Erase Path Heap Overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-100408
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 15:17:21 UTC
Updated2026-11-12 20:04:52 UTC
DescriptionGit 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

EPSS: 0.001170000 probability, percentile 0.016670000 (date 2026-11-12)

Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Git-for-windows Git affected >= 2.43.0.windows.1, < 2.55.0.windows.3 Not specified

References

ReferenceSourceLinkTags
github.com/git-for-windows/git/releases/tag/v2.55.0.windows.3 [email protected] github.com
github.com/git-for-windows/git/commit/b4d1fb62c7e2fdcab5a018e25e51acb196... [email protected] github.com
github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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