PatchTheCVECVE-2025-62496: A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attemp
CVE-2025-62496 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.
A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits. The function calculates the necessary number of bits (n_bits) required to store the BigInt using the formula: $$\text{n\_bits} = (\text{n\_digits} \times 27 + 7) / 8 \quad (\text{for radix 10})$$ * For large input strings (e.g., $79,536,432$ digits or
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 | 0.5% (top 59%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| 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-2025-62496?
quickjs: upgrade to 2025-09-13. Exact commands for each OS are on this page.
Is CVE-2025-62496 being exploited?
CVE-2025-62496 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-2025-62496 affect?
CVE-2025-62496 affects quickjs. Severity is high (CVSS 8.8). A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits. The function calculates the necessary number of
How urgent is CVE-2025-62496?
Priority 46/100. High severity; Public exploit reference
Related CVEs
- CVE-2025-62494 HIGH 8.8 UPGRADE A type confusion vulnerability exists in the handling of the string addition (+) operation within the QuickJS
- CVE-2025-62495 HIGH 8.8 UPGRADE An integer overflow vulnerability exists in the QuickJS regular expression engine (libregexp) due to an incons
- CVE-2025-62490 HIGH 8.8 UPGRADE In quickjs, in js_print_object, when printing an array, the function first fetches the array length and then l
- CVE-2025-62491 HIGH 8.8 UPGRADE A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the g
- CVE-2025-62492 MEDIUM 6.5 UPGRADE A vulnerability stemming from floating-point arithmetic precision errors exists in the QuickJS engine's implem