Out-of-bounds write in Git for Windows - CVE-2026-100408
Published: September 29, 2026
Vulnerability identifier: #VU152716
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100408
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and prevent rejected credentials from being deleted.
The vulnerability exists due to an out-of-bounds write in the match_cred_password function of git-credential-wincred when processing an erase request containing a password field. A remote attacker can cause a victim to process an erase request containing a password field to cause a denial of service and prevent rejected credentials from being deleted.
Exploitation requires git-credential-wincred to be configured as a credential helper and a matching git credential to exist in Windows Credential Manager.
Affected software
Git for Windows
How to mitigate CVE-2026-100408
Install security update from vendor's website.
Git for Windows - update to 2.54.0.3