CVE-2026-114097

Dulwich 0.23.1 before 1.2.8 Symlink Path Traversal via filter_branch Index Filter

State: Published
Severity: 7.3 High
Published: Oct 21, 2026
Updated: Oct 22, 2026
Reserved: Oct 20, 2026

Description

Dulwich from 0.23.1 before 1.2.8 contains a path traversal vulnerability in CommitFilter._apply_index_filter() that allows attackers to write files outside the working directory via symlinks persisting between commits. Attackers can craft a repository where an ancestor commit's symlink redirects a descendant commit's file writes during filter_branch, enabling code execution by writing into .git/hooks.

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-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
dulwichjelmer	0.23.1 to before 1.2.8Affected 1.2.8Not affected

References

GitHub Security Advisory (GHSA-5fqc-mrg8-w798)vendor-advisory
VulnCheck Advisory: Dulwich 0.23.1 before 1.2.8 Symlink Path Traversal via filter_branch Index Filterthird-party-advisory

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