CVE-2026-3979

quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free

State: Published
Severity: 4.8 Medium
Published: Mar 12, 2026
Updated: Mar 12, 2026
Reserved: Mar 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	5.3 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	5.3 Medium	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	4.3 Medium	AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-416 Use After Free
CWE-119 Memory Corruption

Affected Products

Product	Versions
quickjsquickjs-ng	0.12.0Affected 0.12.1Affected

References

VDB-350414 | quickjs-ng quickjs quickjs.c js_iterator_concat_return use after freevdb-entrytechnical-description
VDB-350414 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #769600 | quickjs-ng QuickJS 0.12.1 Use-After-Freethird-party-advisory
https://github.com/quickjs-ng/quickjs/issues/1368issue-tracking
https://github.com/quickjs-ng/quickjs/pull/1370issue-trackingpatch
https://github.com/quickjs-ng/quickjs/issues/1368#issue-4004680962exploitissue-tracking
https://github.com/quickjs-ng/quickjs/commit/daab4ad4bae4ef071ed0294618d6244e92def4cdpatch
https://github.com/quickjs-ng/quickjs/product

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