CVE-2023-45805High· 7.8▾ TwilightPDM Trojan Lockfile
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.5%
It's possible to craft a malicious pdm.lock file that could allow e.g. an insider or a malicious open source project to appear to depend on a trusted PyPI project, but actually install another project.
Project foo can be targeted by creating the project foo-2 and uploading the file foo-2-2.tar.gz to pypi.org. PyPI will see this as project foo-2 version 2, while PDM will see this as project foo version 2-2. The version must only be parseable as a version (and the filename must be a prefix of the project name), but it's not verified to match the version being installed. (Version 2-2 is also not a valid normalized version per PEP 440.)
Matching the project name exactly (not just prefix) would fix the issue. The version should also be verified to avoid version downgrade attacks.
Example pdm.lock snippet to appear to depend on foo but actually install foo-2
"foo 2.2.0" = [
url = "https://files.pythonhosted.org/.../foo-2-2.tar.gz
]
When installing dependencies with PDM, what's actually installed could differ from what's listed in pyproject.toml (including arbitrary code execution on install). It could also be used for downgrade attacks by only changing the version.
pdm <= 2.9.3Refer to the advisory for the patched release.
Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-47764Highpdm is a Python package and dependency manager supporting the latest PEP standards
CVE-2026-47781HighPDM is a Python package and dependency manager