CVE-2025-47154

9.0 criticalEPSS 0.7%

Critical (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."

Severity

CVSS 3.1

9.0 critical

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

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-31)
CWE: CWE-820
Published: 2025-05-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/LadybirdBrowser/ladybird/commit/f5a670421954fc7130c3685b713c621b29516669
https://jessie.cafe/posts/pwning-ladybirds-libjs/
https://news.ycombinator.com/item?id=43852096
https://jessie.cafe/posts/pwning-ladybirds-libjs/

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