{"id":"UBUNTU-CVE-2026-100407","details":"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.","modified":"2026-11-05T11:45:15.879188606Z","published":"2026-11-04T00:00:00Z","upstream":["CVE-2026-100407"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-100407"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-100407"}],"affected":[{"package":{"name":"git","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/git?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.5.0-1","1:2.6.2-1","1:2.6.3-1","1:2.6.4-1","1:2.7.0~rc3-1","1:2.7.0-1","1:2.7.3-0ubuntu1","1:2.7.4-0ubuntu1","1:2.7.4-0ubuntu1.1","1:2.7.4-0ubuntu1.2","1:2.7.4-0ubuntu1.3","1:2.7.4-0ubuntu1.4","1:2.7.4-0ubuntu1.5","1:2.7.4-0ubuntu1.6","1:2.7.4-0ubuntu1.7","1:2.7.4-0ubuntu1.8","1:2.7.4-0ubuntu1.9","1:2.7.4-0ubuntu1.10","1:2.7.4-0ubuntu1.10+esm1","1:2.7.4-0ubuntu1.10+esm3","1:2.7.4-0ubuntu1.10+esm4","1:2.7.4-0ubuntu1.10+esm5","1:2.7.4-0ubuntu1.10+esm6","1:2.7.4-0ubuntu1.10+esm7","1:2.7.4-0ubuntu1.10+esm8","1:2.7.4-0ubuntu1.10+esm9","1:2.7.4-0ubuntu1.10+esm10","1:2.7.4-0ubuntu1.10+esm11","1:2.7.4-0ubuntu1.10+esm13"],"ecosystem_specific":{"binaries":[{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git"},{"binary_name":"git-all","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git-arch"},{"binary_name":"git-core","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git-cvs"},{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git-daemon-run"},{"binary_name":"git-daemon-sysvinit","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_name":"git-el","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_name":"git-email","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git-gui"},{"binary_name":"git-man","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_version":"1:2.7.4-0ubuntu1.10+esm13","binary_name":"git-mediawiki"},{"binary_name":"git-svn","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_name":"gitk","binary_version":"1:2.7.4-0ubuntu1.10+esm13"},{"binary_name":"gitweb","binary_version":"1:2.7.4-0ubuntu1.10+esm13"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100407.json"}},{"package":{"name":"git","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/git?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.14.1-1ubuntu4","1:2.15.1-1ubuntu2","1:2.17.0-1ubuntu1","1:2.17.1-1ubuntu0.1","1:2.17.1-1ubuntu0.3","1:2.17.1-1ubuntu0.4","1:2.17.1-1ubuntu0.5","1:2.17.1-1ubuntu0.6","1:2.17.1-1ubuntu0.7","1:2.17.1-1ubuntu0.8","1:2.17.1-1ubuntu0.9","1:2.17.1-1ubuntu0.10","1:2.17.1-1ubuntu0.11","1:2.17.1-1ubuntu0.12","1:2.17.1-1ubuntu0.13","1:2.17.1-1ubuntu0.14","1:2.17.1-1ubuntu0.15","1:2.17.1-1ubuntu0.16","1:2.17.1-1ubuntu0.17","1:2.17.1-1ubuntu0.18","1:2.17.1-1ubuntu0.18+esm1","1:2.17.1-1ubuntu0.18+esm2","1:2.17.1-1ubuntu0.18+esm3","1:2.17.1-1ubuntu0.18+esm4","1:2.17.1-1ubuntu0.18+esm6","1:2.17.1-1ubuntu0.18+esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"git","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-all","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-cvs","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-daemon-run","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-daemon-sysvinit","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_version":"1:2.17.1-1ubuntu0.18+esm8","binary_name":"git-el"},{"binary_name":"git-email","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-gui","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_version":"1:2.17.1-1ubuntu0.18+esm8","binary_name":"git-man"},{"binary_name":"git-mediawiki","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"git-svn","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_name":"gitk","binary_version":"1:2.17.1-1ubuntu0.18+esm8"},{"binary_version":"1:2.17.1-1ubuntu0.18+esm8","binary_name":"gitweb"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100407.json"}},{"package":{"name":"git","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/git?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.20.1-2ubuntu1","1:2.24.0-1ubuntu1","1:2.24.0-1ubuntu2","1:2.25.0-1ubuntu1","1:2.25.1-1ubuntu1","1:2.25.1-1ubuntu2","1:2.25.1-1ubuntu3","1:2.25.1-1ubuntu3.1","1:2.25.1-1ubuntu3.2","1:2.25.1-1ubuntu3.3","1:2.25.1-1ubuntu3.4","1:2.25.1-1ubuntu3.5","1:2.25.1-1ubuntu3.6","1:2.25.1-1ubuntu3.7","1:2.25.1-1ubuntu3.8","1:2.25.1-1ubuntu3.10","1:2.25.1-1ubuntu3.11","1:2.25.1-1ubuntu3.12","1:2.25.1-1ubuntu3.13","1:2.25.1-1ubuntu3.14","1:2.25.1-1ubuntu3.14+esm1","1:2.25.1-1ubuntu3.14+esm2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