Description
In quickjs, in js_print_object, when printing an array, the function first fetches the array length and then loops over it. The issue is, printing a value is not side-effect free. An attacker-defined callback could run during js_print_value, during which the array could get resized and len1 become out of bounds. This results in a use-after-free.A second instance occurs in the same function during printing of a map or set objects. The code iterates over ms->records list, but once again, elements could be removed from the list during js_print_value call.
Published: 2025-10-16
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Thu, 30 Oct 2025 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Quickjs Project
Quickjs Project quickjs
CPEs cpe:2.3:a:quickjs_project:quickjs:*:*:*:*:*:*:*:*
Vendors & Products Quickjs Project
Quickjs Project quickjs
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 21 Oct 2025 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Quickjs-ng
Quickjs-ng quickjs
Vendors & Products Quickjs-ng
Quickjs-ng quickjs

Thu, 16 Oct 2025 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 16 Oct 2025 16:00:00 +0000

Type Values Removed Values Added
Description In quickjs, in js_print_object, when printing an array, the function first fetches the array length and then loops over it. The issue is, printing a value is not side-effect free. An attacker-defined callback could run during js_print_value, during which the array could get resized and len1 become out of bounds. This results in a use-after-free.A second instance occurs in the same function during printing of a map or set objects. The code iterates over ms->records list, but once again, elements could be removed from the list during js_print_value call.
Title Use-after-free in js_print_object in QuickJS
Weaknesses CWE-416
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L'}


Subscriptions

Quickjs-ng Quickjs
Quickjs Project Quickjs
cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published:

Updated: 2025-10-16T18:08:20.982Z

Reserved: 2025-10-15T08:47:41.877Z

Link: CVE-2025-62490

cve-icon Vulnrichment

Updated: 2025-10-16T18:08:08.581Z

cve-icon NVD

Status : Analyzed

Published: 2025-10-16T16:15:39.270

Modified: 2025-10-30T16:29:11.183

Link: CVE-2025-62490

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-10-21T09:40:02Z

Weaknesses