CVE-2026-37630
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn issue in QuickJS-NG v.0.12.1 allows an attacker to execute arbitrary code via the js_mapped_arguments_mark function
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceQuickJS-NG v0.12.1 contains a vulnerability in the js_mapped_arguments_mark function that allows an attacker to execute arbitrary code. This is a high-severity issue (CVSS 7.3) related to memory handling within the JavaScript engine that could allow complete compromise of any application using the affected component.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify QuickJS-NG installationSearch for quickjs executable or library files on the system using: find / -name 'quickjs*' 2>/dev/null or check common paths like /usr/bin/quickjs, /usr/local/bin/quickjs, or look for libquickjs.* filesAffected if QuickJS-NG binary or library is found on the system
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Determine installed versionRun 'quickjs --version' or check the library version through: quickjs -e 'console.print(globalThis.version)' or inspect the binary metadata with 'strings <binary> | grep -i version'Affected if Version is 0.12.1 specifically (the affected version listed in the summary)
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Verify js_mapped_arguments_mark function presenceExamine the QuickJS-NG binary for the vulnerable function: strings <quickjs_binary> | grep js_mapped_arguments_mark or use objdump -T quickjs | grep mapped_argumentsAffected if The function symbol exists in the binary, indicating the vulnerable code path is present
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Check for JavaScript engine usage contextsIdentify applications or services that import or call QuickJS-NG as a library or execute quickjs: grep -r 'quickjs' /proc/<pid>/cmdline for running processes, or check application dependenciesAffected if Applications are using QuickJS-NG v0.12.1 to process untrusted JavaScript code
You are affected if QuickJS-NG version 0.12.1 is installed and any application uses it to execute JavaScript code, as the js_mapped_arguments_mark vulnerability allows arbitrary code execution through the JavaScript engine.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade to a patched version of QuickJS-NG if available, or isolate QuickJS-NG execution contexts with strong sandboxing and least-privilege configurations to limit the impact of potential exploitation.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-37630 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-37630 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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