CVE-2025-43920: GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS…

high8.1CVSS 3.1

AVNACHPRNUINSUCHIHAH

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS commands via shell metacharacters in an email Subject line. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
gnu	mailman	—	—
gnu	mailman	2.1.1 – 2.1.39	—

CVSS provenance

nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

osv8.1HIGH