Vulnerability · Published Oct 21, 2026 · Assigned by VulnCheck

CVE-2026-114096Dulwich 0.24.0 before 1.2.8 Symlink Write-Through via porcelain.checkout paths

High 7.8

In plain English

A high-severity security flaw in dulwich from jelmer. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.2%top 95.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	dulwich	no fix listed	DEBIAN-CVE-2026-114096
Debian:13	dulwich	no fix listed	DEBIAN-CVE-2026-114096
Debian:14	dulwich	1.2.8-1	DEBIAN-CVE-2026-114096
PyPI	dulwich	1.2.8	GHSA-8w8g-wq8h-fq33
Ubuntu:22.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114096
Ubuntu:24.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114096
Ubuntu:26.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114096

Affected products (as reported)

Vendor	Product	Versions
jelmer	dulwich	0.24.0 – before 1.2.8

Weakness: CWE-59 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-8w8g-wq8h-fq33) vendor-advisory
VulnCheck Advisory: Dulwich 0.24.0 before 1.2.8 Symlink Write-Through via porcelain.checkout paths third-party-advisory