Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-5fqc-mrg8-w798

Dulwich: Symlink directory traversal in filter-branch index_filter via cross-commit state persistence

CVSS 7.3 HighEPSS 0.0019 · 8th percentile

Published by the GitHub Advisory Database at 2 Oct 2026, 18:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
dulwichPyPI>=0.23.1, <1.2.81.2.8
Identifiers
GHSA-5fqc-mrg8-w798 · CVE-2026-114097
Weakness (CWE)
CWE-22 · CWE-59
Tags
Published
2 Oct 2026
Updated
21 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Dulwich versions 0.23.1 up to but not including 1.2.8 are vulnerable to symlink directory traversal in the filter-branch index filter. Files materialized from earlier commits remain in the working directory and can be followed through a symlink, so a crafted repository can cause writes to arbitrary filesystem locations, potentially including `.git/hooks/` for code execution. The victim must run filter-branch with an index filter on the malicious repository. Upgrade to Dulwich 1.2.8.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.3 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0019, the 8th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.