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Fencer Vulns
critical 9.8

CVE-2020-12279 json

An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0

published 2020-04-27 6 y ago modified 2026-07-18 3 mo ago also EUVD-2020-4592 , JLSEC-2025-183

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.1%
EPSS 5.1% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. checkout.c mishandles equivalent filenames that exist because of NTFS short names. This may allow remote code execution when cloning a repository. This issue is similar to CVE-2019-1353.

Patch / fix

  • julia LibGit2_jll 0.28.5+0
  • libgit2 libgit2 0.28.4
  • libgit2 Debian 14, Debian 13, Debian 12 0.28.4+dfsg.1-2

debian advisories DEBIAN-CVE-2020-12279

  • libgit2 Ubuntu Pro 16.04 LTS 0.24.1-2ubuntu0.2+esm2
  • libgit2 Ubuntu Pro 18.04 LTS 0.26.0+dfsg.1-1.1ubuntu0.2+esm1

ubuntu advisories UBUNTU-CVE-2020-12279

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-12279 updated cvss 8.1

libgit2: NTFS protections inactive when running Git in the Windows Subsystem for Linux

  • Red Hat Enterprise Linux 7 libgit2 Red Hat Enterprise Linux 8 libgit2
    affected: no fix available “Fix deferred”

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

Exploit prediction

5.07% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia LibGit2_jll
<0.28.5+0
0.28.5+0

Classification

Weakness
  • CWE-706 Use of Incorrectly-Resolved Name or Reference

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.