CVE-2026-3979: quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-12 · updated 2026-06-17
Weakness: CWE-119

Description

A flaw has been found in quickjs-ng quickjs up to 0.12.1. This affects the function js_iterator_concat_return of the file quickjs.c. This manipulation causes use after free. The attack requires local access. The exploit has been published and may be used. Patch name: daab4ad4bae4ef071ed0294618d6244e92def4cd. Applying a patch is the recommended action to fix this issue.

Affected products

quickjs-ng quickjs: 0.12.0, 0.12.1

References

https://github.com/quickjs-ng/quickjs/
https://github.com/quickjs-ng/quickjs/commit/daab4ad4bae4ef071ed0294618d6244e92def4cd
https://github.com/quickjs-ng/quickjs/issues/1368
https://github.com/quickjs-ng/quickjs/issues/1368#issue-4004680962
https://github.com/quickjs-ng/quickjs/pull/1370
https://vuldb.com/?ctiid.350414
https://vuldb.com/?id.350414
https://vuldb.com/?submit.769600

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