CVE-2026-3979— quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free
Quick assessment
Affected
quickjs-ng quickjs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
QuickJS是QuickJS开源的一个小型且可嵌入的 Javascript 引擎。 QuickJS 0.12.1及之前版本存在资源管理错误漏洞，该漏洞源于对文件quickjs.c中函数js_iterator_concat_return的错误操作，可能导致释放后重用。
Possible ATT&CK Techniques 1 AI
T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2026-3979
Vulnerability Information
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Vulnerability Title
quickjs-ng quickjs quickjs.c js_iterator_concat_return use after free
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
QuickJS 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QuickJS是QuickJS开源的一个小型且可嵌入的 Javascript 引擎。 QuickJS 0.12.1及之前版本存在资源管理错误漏洞，该漏洞源于对文件quickjs.c中函数js_iterator_concat_return的错误操作，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| quickjs-ng | quickjs | 0.12.0 | - |
|
II. Public POCs for CVE-2026-3979
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-3979 (2)
News Coverage for CVE-2026-3979 (1)
Other References for CVE-2026-3979 (1)
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V. Comments for CVE-2026-3979
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