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TI-2026-83831 Aliases CVE-2026-120439GHSA-xffc-9827-rpvc

Heap buffer overflow in QuickJS-NG TypedArray sort on 32-bit hosts

Priority HIGH 69CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

QuickJS-NG before 0.16.0 contains an integer overflow in js_typed_array_sort() in quickjs.c. Attackers who can run JavaScript can call TypedArray.prototype.sort with a comparator on a typed array near 2^30 elements, which wraps the allocation size (CWE-190) and lets them write past a heap buffer on 32-bit hosts. The overflow can crash the process or potentially execute code.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

QuickJS-NG before 0.16.0 contains an integer overflow in js_typed_array_sort() in quickjs.c that allows attackers to cause a heap buffer overflow on 32-bit hosts. Attackers who can run JavaScript can call TypedArray.prototype.sort with a comparator on a typed array near 2^30 elements, wrapping the allocation size and writing indices past the buffer to crash or potentially execute code.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00343 28th percentileScored 2026-11-07
Fix Fixed QuickJS-NG (quickjs-ng): 0.16.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
quickjs-ngQuickJS-NGbefore 0.16.00.16.0Patch availableCNA
  • QuickJS-NG Vendorquickjs-ng Affected before 0.16.0 Fixed in 0.16.0 Patch available CNA

Remediation

Upgrade QuickJS-NG to version 0.16.0 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA QuickJS-NG (quickjs-ng) Fixed in 0.16.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    QuickJS-NG 0.16.0

    3 records Highest priority Priority HIGH 1 HIGH, 2 LOW

    Other records, highest priority first

    • TI-2026-83830 Heap buffer overflow in QuickJS-NG via Proxy ownKeys enumerationPriority LOW 38
    • TI-2026-83832 Memory leak in QuickJS-NG Atomics.store exhausts heap memoryPriority LOW 37
    Show all 3 records →

Timeline

  1. 2026-11-02 Threatist record created from CVE-2026-120439
  2. 2026-11-02 Alias added: GHSA-xffc-9827-rpvc
  3. 2026-11-04 Priority changed: MEDIUM → LOW
  4. 2026-11-06 CISA SSVC decision points changed
  5. 2026-11-06 Priority changed: LOW → HIGH

References

Patch 1

Advisory 1

Other 2

  • TI-2026-00603 quickjs-ng quickjs quickjs.c js_typed_array_constructor heap-based overflow CVSS 4.0MEDIUM 6.9
  • TI-2025-29366 quickjs-ng through 0.9.0 has an incorrect size calculation in JS_ReadBigInt for a BigInt… CVSS 3.1HIGH 8.4
  • TI-2025-29365 Resource allocation without limits in QuickJS CVSS 3.1HIGH 7.8
  • TI-2026-00873 quickjs-ng quickjs quickjs.c js_typed_array_constructor_ta heap-based overflow CVSS 4.0MEDIUM 5.3
  • TI-2026-00872 quickjs-ng quickjs Atomics Ops quickjs.c use after free CVSS 4.0MEDIUM 5.3
  • TI-2026-00604 quickjs-ng quickjs quickjs.c js_typed_array_sort heap-based overflow CVSS 4.0MEDIUM 5.3
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences