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CVE

CWE

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CVE-2026-28684

Published: Apr 20, 2026

Modified: Apr 20, 2026

PUBLISHED

CVSS v3.1

6.6

MEDIUM

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.

Vendor	Product	Versions
theskumar	python-dotenv	affected `< 1.2.2`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

References

https://github.com/theskumar/python-dotenv/security/advisories/GHSA-mf9w-mj56-hr94

x_refsource_CONFIRM

https://github.com/theskumar/python-dotenv/commit/790c5c02991100aa1bf41ee5330aca75edc51311

x_refsource_MISC

https://github.com/theskumar/python-dotenv/releases/tag/v1.2.2

x_refsource_MISC

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