CVE-2026-114096

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

State: Published
Severity: 7.3 High
Published: Oct 21, 2026
Updated: Oct 28, 2026
Reserved: Oct 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.3 High	CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
dulwichjelmer	0.24.0 to before 1.2.8Affected 1.2.8Not affected

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 pathsthird-party-advisory

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