MEDIUM 6.6

PYSEC-2026-2270

Details

python-dotenv reads key-value pairs from a .env file and can set them as environment variables. Prior to version 1.2.2, `set_key()` and `unset_key()` in python-dotenv follow symbolic links when rewriting `.env` files, allowing a local attacker to overwrite arbitrary files via a crafted symlink when a cross-device rename fallback is triggered. Users should upgrade to v.1.2.2 or, as a workaround, apply the patch manually.

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Affected packages

PyPI / python-dotenv

Introduced in: 0 Fixed in: 1.2.2

Fix pip install --upgrade 'python-dotenv>=1.2.2'

References

https://github.com/theskumar/python-dotenv/releases/tag/v1.2.2 [ADVISORY]
https://github.com/theskumar/python-dotenv/commit/790c5c02991100aa1bf41ee5330aca75edc51311 [FIX]
https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94 [FIX]