CVE-2025-62490
Quickjs use-after-free
- Published16 Oct 2025
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 3.1 breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2025-62490 being actively exploited?
CVE-2025-62490 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.41%.
How severe is CVE-2025-62490?
CVE-2025-62490 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.41% probability of exploitation.
Which products are affected by CVE-2025-62490?
Affected products include Quickjs.
How do I fix CVE-2025-62490?
Upgrade affected software to a fixed version, for example Quickjs 2025-09-13 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2025-62490 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.