Medium 5.3Published Mar 11, 2026

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

Updated under an hour ago (Oct 26, 2026, 2:10 AM ET)

Does this affect you?

It affects quickjs-ng quickjs. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for quickjs-ng quickjs

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-416, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Mar 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

quickjs-ng quickjs quickjs_ng:quickjs (from the name)	0.12.0; 0.12.1	CNA record

References

https://vuldb.com/?id.350414vdb-entry, technical-description
https://vuldb.com/?ctiid.350414signature, permissions-required
https://vuldb.com/?submit.769600third-party-advisory
https://github.com/quickjs-ng/quickjs/issues/1368issue-tracking
https://github.com/quickjs-ng/quickjs/pull/1370issue-tracking, patch
https://github.com/quickjs-ng/quickjs/issues/1368#issue-4004680962exploit, issue-tracking
https://github.com/quickjs-ng/quickjs/commit/daab4ad4bae4ef071ed0294618d6244e92def4cdpatch
https://github.com/quickjs-ng/quickjs/product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.