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Vulnerability record · CVE-2025-62490 · published 16 October 2025

CVE-2025-62490: Quickjs project quickjs use after free vulnerability

QQuickjs Project · Quickjs

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.

8.8 CVSS 4.0 High EPSS 0.41% · top 67.6% CWE-416 · Use after free
8.8CVSS 4.0 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bellard.org/quickjs/Changelog Release Notes
https://issuetracker.google.com/434196651 ExploitIssue Tracking

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2025-62491Quickjs project quickjs use after free vulnerabilityA Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promis…EPSS 0.41%8.4CVE-2025-46688Quickjs-ng quickjs vulnerabilityquickjs-ng through 0.9.0 has an incorrect size calculation in JS_ReadBigInt for a BigInt, leading to a heap-based buffer overflow. QuickJS before 202…EPSS 0.32%7.5CVE-2025-69654Quickjs project quickjs uncontrolled resource consumption vulnerabilityA crafted JavaScript input executed with the QuickJS release 2025-09-13, fixed in commit fcd33c1afa7b3028531f53cd1190a3877454f6b3 (2025-12-11),`qjs` …EPSS 0.28%7.5CVE-2023-48183Quickjs project quickjs null pointer dereference vulnerabilityQuickJS before c4cdd61 has a build_for_in_iterator NULL pointer dereference because of an erroneous lexical scope of "this" with eval.EPSS 0.64%7.5CVE-2023-31922Quickjs project quickjs out-of-bounds write vulnerabilityQuickJS commit 2788d71 was discovered to contain a stack-overflow via the component js_proxy_isArray at quickjs.c.EPSS 0.73%7.5CVE-2020-22876Quickjs project quickjs classic buffer overflow vulnerabilityBuffer Overflow vulnerability in quickjs.c in QuickJS, allows remote attackers to cause denial of service. This issue is resolved in the 2020-07-05 r…EPSS 1.6%7.1CVE-2025-62495Quickjs project quickjs vulnerabilityAn integer overflow vulnerability exists in the QuickJS regular expression engine (libregexp) due to an inconsistent representation of the bytecode b…EPSS 0.46%7.1CVE-2025-62496Quickjs project quickjs integer overflow vulnerabilityA vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string w…EPSS 0.48%

Source: NIST National Vulnerability Database (record CVE-2025-62490), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.