CVE-2026-3979

1.9 lowEPSS 0.1%

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.

Severity

CVSS 4.0

1.9 low

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

CVSS 3.1

5.3 medium

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-31)
CWEs: CWE-119, CWE-416
Published: 2026-03-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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

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