Improper Preservation of Consistency Between Independent Representations of Shared State Affecting dulwich package, versions [,1.2.20)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-DULWICH-22220108
- published5 Nov 2026
- disclosed5 Nov 2026
- creditIsabel Mill
Introduced: 5 Nov 2026
NewCVE-2026-122299 (opens in a new tab)How to fix?
Upgrade dulwich to version 1.2.20 or higher.
Overview
Affected versions of this package are vulnerable to Improper Preservation of Consistency Between Independent Representations of Shared State via _parse_commit in dulwich/objects.py, which resolves a duplicate tree header in a commit object to the last occurrence rather than the first, diverging from core git's behavior. An attacker can craft a commit object containing two tree headers so that reviewers and CI systems using git see a benign tree, while a dulwich-based checkout resolves to a different attacker-controlled tree containing malicious build scripts such as setup.py, resulting in unreviewed code execution on the install or build host.