CVE-2026-28684
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.
- CVSS 3.1
- 6.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-26)
- CWEs
- CWE-59, CWE-61
- Published
- Modified
- Record from
- the NVD, synced
Affected
- saurabh-kumar:python-dotenv
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mf9w-mj56-hr94 | PyPI | python-dotenv | <1.2.2 | 1.2.2 |
| PYSEC-2026-2270 | PyPI | python-dotenv | <1.2.2 | 1.2.2 |
References
- https://github.com/theskumar/python-dotenv/commit/790c5c02991100aa1bf41ee5330aca75edc51311
- https://github.com/theskumar/python-dotenv/releases/tag/v1.2.2
- https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94
- https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94