python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback
Summary
python-dotenv: Symlink following in set_key allows arbitrary file overwrite via cross-device rename fallback
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-28684 python-dotenv
- Ubuntu UBUNTU-CVE-2026-28684 python-dotenv
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- web github.com