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TI-2026-78707 Aliases CVE-2026-114094

Path traversal in Dulwich lets attackers write files on Windows

Priority HIGH 73CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Dulwich before 1.2.9 does not validate DOS drive letter prefixes in Git tree path elements on Windows (CWE-22). A remote attacker can supply a malicious repository that writes files outside the worktree, which can lead to remote code execution.

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

Description from the CNA

Dulwich before 1.2.9 fails to validate DOS drive letter prefixes in Git tree path elements on Windows, allowing arbitrary file write. Attackers can craft a malicious repository with a tree entry named 'C:' that bypasses NTFS validation and writes files outside the worktree to achieve remote code execution.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0095 61st percentileScored 2026-11-07
Fix Fixed dulwich (jelmer): 1.2.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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
jelmerdulwichbefore 1.2.91.2.9Patch availableCNA
  • dulwich Vendorjelmer Affected before 1.2.9 Fixed in 1.2.9 Patch available CNA

Remediation

Upgrade Dulwich to version 1.2.9 or later, which fixes this issue.

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

  • Fix · CNA dulwich (jelmer) Fixed in 1.2.9

Fixed in the same release

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

  • Release ·

    jelmer dulwich 1.2.9

    2 records Highest priority Priority HIGH 1 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-78708 Infinite recursion in Dulwich pack parsing causes denial of servicePriority LOW 37
    Show all 2 records →

Vendor assessments

Red Hat

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

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-2026-114094
  2. 2026-10-21 Affected versions changed · Red Hat
  3. 2026-10-21 CVSS score added · Red Hat
  4. 2026-10-22 Priority changed: MEDIUM → LOW
  5. 2026-10-27 Affected versions changed · Red Hat
  6. 2026-10-28 CISA SSVC decision points changed
  7. 2026-10-28 Priority changed: LOW → HIGH

References

Advisory 1

  • 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
  • TI-2026-78708 Infinite recursion in Dulwich pack parsing causes denial of service CVSS 4.0HIGH 7.1
See all 10 →

Sources

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