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 v3 6.6 MEDIUM

6.6^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.3 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/theskumar/python-dotenv/commit/790c5c02991100aa1bf41ee5330aca75edc51311	Patch
https://github.com/theskumar/python-dotenv/releases/tag/v1.2.2	Release Notes
https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94	Exploit Patch Vendor Advisory
https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:saurabh-kumar:python-dotenv:*:*:*:*:*:python:*:*

History

26 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) python-dotenv lee pares clave-valor de un archivo .env y puede establecerlos como variables de entorno. Antes de la versión 1.2.2, “set_key()” y “unset_key()” en python-dotenv siguen enlaces simbólicos al reescribir archivos “.env”, permitiendo a un atacante local sobrescribir archivos arbitrarios a través de un symlink manipulado cuando se activa una alternativa de renombrado entre dispositivos. Los usuarios deberían actualizar a la v.1.2.2 o, como solución alternativa, aplicar el parche manualmente.

Information

Published : 2026-04-20 17:16

Updated : 2026-10-26 21:10

NVD link : CVE-2026-28684

Mitre link : CVE-2026-28684

CVE.ORG link : CVE-2026-28684

JSON object : View

Products Affected

saurabh-kumar

python-dotenv

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

CWE-61

UNIX Symbolic Link (Symlink) Following

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