CVE-2025-47154: Ladybird

Critical severity, CVSS 9.0. EPSS: 0.7% chance of exploitation in the next 30 days.

LibJS in Ladybird before f5a6704 mishandles the freeing of the vector that arguments_list references, leading to a use-after-free, and allowing remote attackers to execute arbitrary code via a crafted .js file. NOTE: the GitHub README says "Ladybird is in a pre-alpha state, and only suitable for use by developers."

Affected products

• Ladybird Ladybird

Published 2025-05-01. Last modified 2026-06-17.