Native code execution via uninitialized GC pointers
Published May 11, 2026 · Updated May 11, 2026
Memory corruption in QuickJS-NG 0.12.1 allows remote attackers to execute arbitrary native code through malicious JavaScript execution. The js_mapped_arguments_mark garbage collector passes non-detached JSVarRef entries with uninitialized link pointers to gc_decref_child, whose list_del call dereferences them and creates a write-what-where primitive. Exploitation requires an embedding application to evaluate attacker-controlled JavaScript and trigger garbage collection; the primitive permits process-memory corruption and native code execution.
Summary
What happened
Memory corruption in QuickJS-NG 0.12.1 allows remote attackers to execute arbitrary native code through malicious JavaScript execution. The js_mapped_arguments_mark garbage collector passes non-detached JSVarRef entries with uninitialized link pointers to gc_decref_child, whose list_del call dereferences them and creates a write-what-where primitive. Exploitation requires an embedding application to evaluate attacker-controlled JavaScript and trigger garbage collection; the primitive permits process-memory corruption and native code execution.
The record
- CVE
- CVE-2026-37630
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-94, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- write-what-where.js proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo