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Fencer Vulns
medium 4.4

CVE-2026-100407 json

Git for Windows: git-credential-wincred OAuth Store Heap Overflow

published 2026-11-04 5 d ago modified 2026-11-05 3 d ago also EUVD-2026-116936

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

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-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.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-100407 updated cvss 4.4

git: git: Denial of Service via heap buffer overflow in credential helper

  • Red Hat Hardened Images git 2.52.0-1.el10
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 git, gitk, gitweb, git-all, git-cvs, git-gui, +7 more Red Hat Enterprise Linux 7 git, gitk, git-hg, git-p4, gitweb, git-all, +13 more Red Hat Enterprise Linux 8 git, gitk, gitweb, git-all, git-gui, git-svn, +9 more Red Hat Enterprise Linux 9 git, gitk, gitweb, git-all, git-gui, git-svn, +9 more Red Hat Enterprise Linux 10 git 2.52.0-1.el10 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +2 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat Satellite 6 rubygem-git 1.18.0-1.el9sat
    under investigation

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Affected products

  • git-for-windows git

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.