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Vulnerability · Published Aug 20, 2026 · Assigned by GitHub_M

CVE-2026-53584libgit2: Submodule path traversal

Medium 4.3

In plain English

A medium-severity path traversal in libgit2 from libgit2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 74.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, libgit2 does not reject traversal components in a submodule path loaded from .gitmodules. The affected src/libgit2/submodule.c paths include git_submodule_lookup and git_submodule_add_setup. A crafted repository can specify a path such as ../escape-target, and applications that initialize the submodule can create directories outside the repository working tree. This issue is fixed in versions 1.8.6 and 1.9.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23libgit21.9.6-r0ALPINE-CVE-2026-53584
Alpine:v3.24libgit21.9.6-r0ALPINE-CVE-2026-53584
Debian:12libgit21.5.1+ds-1+deb12u2DEBIAN-CVE-2026-53584
Debian:13libgit21.9.0+ds-2+deb13u1DEBIAN-CVE-2026-53584
Debian:14libgit21.9.6+ds-1DEBIAN-CVE-2026-53584
Ubuntu:24.04:LTSlibgit21.7.2+ds-1ubuntu3.1UBUNTU-CVE-2026-53584
Ubuntu:26.04:LTSlibgit21.9.1+ds-1ubuntu1.1UBUNTU-CVE-2026-53584

Affected products (as reported)

VendorProductVersions
libgit2 libgit2 < 1.8.6>= 1.9.0, < 1.9.5

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References