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Vulnerability · Published Mar 12, 2026 · Assigned by VulDB

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

Medium 5.3

In plain English

A medium-severity use-after-free in quickjs from quickjs-ng. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:25.10quickjsno fix listedUBUNTU-CVE-2026-3979
Ubuntu:26.04:LTSquickjsno fix listedUBUNTU-CVE-2026-3979
Ubuntu:26.10quickjsno fix listedUBUNTU-CVE-2026-3979

Affected products (as reported)

VendorProductVersions
quickjs-ng quickjs 0.12.00.12.1

Weakness: CWE-416, CWE-119 · Vector: 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

References