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CVE-2026-122299

8.8, high

Dulwich before 1.2.20 contains a commit object parsing vulnerability where the read path in _parse_commit resolves a duplicate tree…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
4 Nov 2026yesterday

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.

Details

Vendor
Jelmer
Product
dulwich
Weakness
CWE-115 (opens in a new tab)
Status
Deferred
Updated
4 Nov 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References 3

Patches and fixes 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Jelmer CVEs

Every Jelmer CVE we hold

Same vendor in what we hold, not a known link between the flaws.

Beyond this page

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 5 Nov 2026, not the live upstream state.