Use After Free Affecting bellard/quickjs package, versions [,2025.09.13)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-BELLARDQUICKJS-13610753
- published17 Oct 2025
- disclosed16 Oct 2025
- creditUnknown
Introduced: 16 Oct 2025
NewCVE-2025-62491 (opens in a new tab)How to fix?
Upgrade bellard/quickjs to version 2025.09.13 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the js_std_promise_rejection_check() function when iterating over the rejected_promise_list. An attacker can achieve arbitrary code execution or cause a crash by supplying a malicious Error object with a custom property getter that, when accessed, executes code to remove and free the current promise entry during iteration, leading to access of freed memory.