PatchTheCVECVE-2025-62490: In quickjs, in js_print_object, when printing an array, the function first fetches the array length and then l
CVE-2025-62490 is a high-severity flaw (CVSS 8.8) affecting quickjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 iterate
Why this priority
- High severity
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 65%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2025-10-16 |
| Last modified | 2026-10-19 |
Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-62490?
quickjs: upgrade to 2025-09-13. Exact commands for each OS are on this page.
Is CVE-2025-62490 being exploited?
CVE-2025-62490 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-62490 affect?
CVE-2025-62490 affects quickjs. Severity is high (CVSS 8.8). 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
How urgent is CVE-2025-62490?
Priority 45/100. High severity; Public exploit reference
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