CVE-2026-28684 | BDVDB-2026-327790 Detail

theskumarpython-dotenv

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact high, availability impact high. Attack vector: local.

Weaknesses#

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

References#

Exploit#

No public exploit known

History#

Version 12026-04-20Record published in the CVE List.

Published

Published: 2026-04-20
Last modified: 2026-04-20

Vendor information

Vendor: theskumar
Product: python-dotenv

All theskumar vulnerabilities

Score

6.6 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 16.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 1.2.2
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.6 Medium

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

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).