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...

9.0 CVSS

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."

Classification

CVE ID: CVE-2025-47154

CVSS Base Severity: CRITICAL

CVSS Base Score: 9.0

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

Problem Types

CWE-820 Missing Synchronization

Affected Products

Vendor: Ladybird

Product: Ladybird

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.23% (probability of being exploited)

EPSS Percentile: 46.03% (scored less or equal to compared to others)

EPSS Date: 2025-05-30 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: poc

SSVC Technical Impact: total

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2025-47154
https://news.ycombinator.com/item?id=43852096
https://jessie.cafe/posts/pwning-ladybirds-libjs/
https://github.com/LadybirdBrowser/ladybird/commit/f5a670421954fc7130c3685b713c621b29516669

Timeline