VULNERABILITY INTELLIGENCE

CVE-2026-28684

CVSS score6.6 MEDIUM
EPSS probability0.25%
CISA KEVNot currently listed
Published2026-04-20
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Description

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.

Weakness classification

  • CWE-59: Improper Link Resolution Before File Access ('Link Following')
  • CWE-61: UNIX Symbolic Link (Symlink) Following

Primary references