CVE-2026-3979

quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free

MEDIUM
5.3
CVSS Score
Published: March 12, 2026 at 03:32 AM UTC
Updated: June 17, 2026 at 10:44 AM UTC
1 product affected across 1 vendorQuickjs

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.1%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (8)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/?id.350414
SignaturePermissions Required
Source: cverecord
https://vuldb.com/?ctiid.350414
Third Party Advisory
Source: cverecord
https://vuldb.com/?submit.769600
Issue TrackingPatch
Source: cverecord
https://github.com/quickjs-ng/quickjs/pull/1370

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-416CWE-119

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