---
id: CVE-2026-114097
title: >-
  Dulwich 0.23.1 before 1.2.8 Symlink Path Traversal via filter_branch Index
  Filter
summary: >-
  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 craf…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-22
vendor: jelmer
product: dulwich
affected:
  - dulwich >= 0.23.1 < 1.2.8
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T00:37:00.461Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114097'
references:
  - url: 'https://github.com/jelmer/dulwich/security/advisories/GHSA-5fqc-mrg8-w798'
    label: GitHub Security Advisory (GHSA-5fqc-mrg8-w798)
  - url: >-
      https://www.vulncheck.com/advisories/dulwich-0.23.1-before-1.2.8-symlink-path-traversal-via-filter-branch-index-filter
    label: >-
      VulnCheck Advisory: Dulwich 0.23.1 before 1.2.8 Symlink Path Traversal via
      filter_branch Index Filter
tags:
  - cve.org
ingestedAt: '2026-10-21T01:37:08.016Z'
---

## Overview

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.

## Affected

- `dulwich >= 0.23.1 < 1.2.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.