CVE-2025-47154

Description

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."

CVSS v3.1 Score

9.0

CRITICAL

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

Weakness Type (CWE)

CWE-820 CWE-820

References

Other 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/

Frequently Asked Questions

What is CVE-2025-47154? +

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." It has a CVSS v3.1 base score of 9.0 (CRITICAL).

How severe is CVE-2025-47154? +

CVE-2025-47154 has a CVSS v3.1 score of 9.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

How do I check if I'm vulnerable to CVE-2025-47154? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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