CVE-2026-100408
Git for Windows: git-credential-wincred Erase Path Heap Overflow
Git 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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Git for Windows: git-credential-wincred Erase Path Heap Overflow
Git 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.
- Record
CVE-2026-100408- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L - Weakness
- CWE-787
- Updated
- 2026-11-09
EUVDEUVD-2026-116937
Git 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.
- Record
EUVD-2026-116937- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L - Updated
- 2026-11-09
NVD
Git 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.
- Record
CVE-2026-100408- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L - Weakness
- CWE-787
- Updated
- 2026-11-09
OSV
Git for Windows: git-credential-wincred Erase Path Heap Overflow
Git 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.
- Record
CVE-2026-100408- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L - Weakness
- CWE-787
- Updated
- 2026-11-06
OSVUBUNTU-CVE-2026-100408
Git 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.
- Record
UBUNTU-CVE-2026-100408- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L - Updated
- 2026-11-06
OSVAZL-112738 No score
CVE-2026-100408 affecting package git 2.45.4-3
Git 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.
- Record
AZL-112738- Updated
- 2026-11-07
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
gitAzure Linux:3 |
through 2.45.4-3 | None known |
gitUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1:2.5.0-11:2.6.2-11:2.6.3-11:2.6.4-11:2.7.0~rc3-1 Show 24 moreShow less1:2.7.0-11:2.7.3-0ubuntu11:2.7.4-0ubuntu11:2.7.4-0ubuntu1.11:2.7.4-0ubuntu1.21:2.7.4-0ubuntu1.31:2.7.4-0ubuntu1.41:2.7.4-0ubuntu1.51:2.7.4-0ubuntu1.61:2.7.4-0ubuntu1.71:2.7.4-0ubuntu1.81:2.7.4-0ubuntu1.91:2.7.4-0ubuntu1.101:2.7.4-0ubuntu1.10+esm11:2.7.4-0ubuntu1.10+esm31:2.7.4-0ubuntu1.10+esm41:2.7.4-0ubuntu1.10+esm51:2.7.4-0ubuntu1.10+esm61:2.7.4-0ubuntu1.10+esm71:2.7.4-0ubuntu1.10+esm81:2.7.4-0ubuntu1.10+esm91:2.7.4-0ubuntu1.10+esm101:2.7.4-0ubuntu1.10+esm111:2.7.4-0ubuntu1.10+esm13 |
None known |
gitUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 1:2.14.1-1ubuntu41:2.15.1-1ubuntu21:2.17.0-1ubuntu11:2.17.1-1ubuntu0.11:2.17.1-1ubuntu0.3 Show 21 moreShow less1:2.17.1-1ubuntu0.41:2.17.1-1ubuntu0.51:2.17.1-1ubuntu0.61:2.17.1-1ubuntu0.71:2.17.1-1ubuntu0.81:2.17.1-1ubuntu0.91:2.17.1-1ubuntu0.101:2.17.1-1ubuntu0.111:2.17.1-1ubuntu0.121:2.17.1-1ubuntu0.131:2.17.1-1ubuntu0.141:2.17.1-1ubuntu0.151:2.17.1-1ubuntu0.161:2.17.1-1ubuntu0.171:2.17.1-1ubuntu0.181:2.17.1-1ubuntu0.18+esm11:2.17.1-1ubuntu0.18+esm21:2.17.1-1ubuntu0.18+esm31:2.17.1-1ubuntu0.18+esm41:2.17.1-1ubuntu0.18+esm61:2.17.1-1ubuntu0.18+esm8 |
None known |
gitUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 1:2.20.1-2ubuntu11:2.24.0-1ubuntu11:2.24.0-1ubuntu21:2.25.0-1ubuntu11:2.25.1-1ubuntu1 Show 21 moreShow less1:2.25.1-1ubuntu21:2.25.1-1ubuntu31:2.25.1-1ubuntu3.11:2.25.1-1ubuntu3.21:2.25.1-1ubuntu3.31:2.25.1-1ubuntu3.41:2.25.1-1ubuntu3.51:2.25.1-1ubuntu3.61:2.25.1-1ubuntu3.71:2.25.1-1ubuntu3.81:2.25.1-1ubuntu3.101:2.25.1-1ubuntu3.111:2.25.1-1ubuntu3.121:2.25.1-1ubuntu3.131:2.25.1-1ubuntu3.141:2.25.1-1ubuntu3.14+esm11:2.25.1-1ubuntu3.14+esm21:2.25.1-1ubuntu3.14+esm31:2.25.1-1ubuntu3.14+esm41:2.25.1-1ubuntu3.14+esm51:2.25.1-1ubuntu3.14+esm6 |
None known |
gitUbuntu:22.04:LTS |
All versions, plus listed versions 1:2.32.0-1ubuntu11:2.33.1-1ubuntu11:2.34.1-1ubuntu11:2.34.1-1ubuntu1.11:2.34.1-1ubuntu1.2 Show 14 moreShow less1:2.34.1-1ubuntu1.41:2.34.1-1ubuntu1.51:2.34.1-1ubuntu1.61:2.34.1-1ubuntu1.81:2.34.1-1ubuntu1.91:2.34.1-1ubuntu1.101:2.34.1-1ubuntu1.111:2.34.1-1ubuntu1.121:2.34.1-1ubuntu1.131:2.34.1-1ubuntu1.141:2.34.1-1ubuntu1.151:2.34.1-1ubuntu1.161:2.34.1-1ubuntu1.171:2.34.1-1ubuntu1.18 |
None known |
gitUbuntu:24.04:LTS |
All versions, plus listed versions 1:2.40.1-1ubuntu11:2.43.0-1ubuntu11:2.43.0-1ubuntu51:2.43.0-1ubuntu61:2.43.0-1ubuntu7 Show 4 moreShow less1:2.43.0-1ubuntu7.11:2.43.0-1ubuntu7.21:2.43.0-1ubuntu7.31:2.43.0-1ubuntu7.4 |
None known |
gitUbuntu:26.10 |
All versions, plus listed versions 1:2.53.0-1ubuntu11:2.55.0-1ubuntu11:2.55.0-1ubuntu1.1 |
None known |
gitUbuntu:26.04:LTS |
All versions, plus listed versions 1:2.51.0-1ubuntu11:2.53.0-1ubuntu11:2.53.0-1ubuntu1.1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| references | CVE List, EUVD | |
| affected, aliases, references | OSV | |
| affected, aliases, published, references | OSV | |
| aliases, references | NVD, OSV | |
| cwes, references, severity, title | CVE List | |
| first indexed | EUVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-100408 is a medium vulnerability (CVSS 4.4) in Git-for-windows Git, published November 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. No source names a fixed version.
References
github.com/git-for-windows/git/security/advisories/GHSA-5j7x-r6vf-jhq2
nvd.nist.gov/vuln/detail/CVE-2026-100408
ubuntu.com/security/CVE-2026-100408
cve.org/CVERecord?id=CVE-2026-100408