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TI-2026-78710 Aliases CVE-2026-114097

Symlink path traversal in Dulwich filter_branch enables file writes

Priority LOW 33CWE-22Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

Dulwich from 0.23.1 before 1.2.8 contains a path traversal flaw (CWE-22) in CommitFilter._apply_index_filter(). Symlinks that persist between commits let attackers write files outside the working directory during filter_branch. A local attacker needing no privileges can craft a repository whose symlink redirects writes into .git/hooks, enabling code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-07
Fix Partial dulwich (jelmer): 1.2.8Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
jelmerdulwich0.23.1 to before 1.2.81.2.8Patch availableCNA
  • dulwich Vendorjelmer Affected 0.23.1 to before 1.2.8 Fixed in 1.2.8 Patch available CNA

Remediation

Upgrade Dulwich to version 1.2.8. Red Hat lists Red Hat Ansible Automation Platform 2 and Red Hat OpenShift AI (RHOAI) as affected with no fix plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA dulwich (jelmer) Fixed in 1.2.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    jelmer dulwich 1.2.8

    3 records Highest priority Priority HIGH 1 HIGH, 2 LOW

    Other records, highest priority first

    • TI-2026-78709 Symlink following in Dulwich checkout allows arbitrary file writesPriority HIGH 67
    • TI-2026-78711 Dulwich Path Traversal via Stash Pop SymlinksPriority LOW 33
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Ansible Automation Platform 2AffectedNo fix yet
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Not affected: 5 products
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-114097
  2. 2026-10-22 Priority changed: MEDIUM → LOW
  3. 2026-10-22 CISA SSVC decision points changed
  4. 2026-10-23 Affected versions changed · Red Hat
  5. 2026-10-23 CVSS score added · Red Hat

References

Advisory 1

  • TI-2026-78707 Path traversal in Dulwich lets attackers write files on Windows CVSS 4.0HIGH 8.7
  • TI-2026-37846 Path traversal in jelmer dulwich CVSS 3.1HIGH 7.5
  • TI-2026-30843 Dulwich Vulnerable to Command Injection via Merge Driver Path CVSS 4.0HIGH 7.7
  • TI-2026-78709 Symlink following in Dulwich checkout allows arbitrary file writes CVSS 4.0HIGH 7.3
  • TI-2026-30613 Dulwich has an arbitrary file write via NTFS-hostile tree entries on Windows CVSS 3.1HIGH 8.8
  • TI-2026-85266 Dulwich commit parser picks the wrong tree from duplicate headers CVSS 4.0HIGH 8.6
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences