CVE-2026-122299 | BDVDB-2026-400437 Detail

Description#

Dulwich before 1.2.20 contains a commit object parsing vulnerability where the read path in _parse_commit resolves a duplicate tree header to the last occurrence instead of the first, diverging from core git's resolution behavior, while Poetry 2.5.1 ships this version and uses dulwich by default for git dependency installation. Attackers can craft a commit object with two tree headers so that reviewers and CI using git see a benign tree while Poetry's 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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-11-04Record published in the CVE List.
2. Version 22026-11-09Most recent update recorded in the CVE List.