CVE-2025-69653Public exploitNetwork attack vector

Interpreter crash via unrooted module function

Published Mar 6, 2026 · Updated Mar 6, 2026

Use-after-free in QuickJS 2025-09-13 allows remote attackers to crash the qjs interpreter with a crafted JavaScript module. js_create_module_bytecode_function delays storing m->func_obj until after js_closure2 builds the module closure, leaving the function available for collection and subsequent use. A user must execute the crafted input as a module with the -m option; garbage collection then fails a reference-count assertion and aborts the process with SIGABRT.

CVSS severity6.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in QuickJS 2025-09-13 allows remote attackers to crash the qjs interpreter with a crafted JavaScript module. js_create_module_bytecode_function delays storing m->func_obj until after js_closure2 builds the module closure, leaving the function available for collection and subsequent use. A user must execute the crafted input as a module with the -m option; garbage collection then fails a reference-count assertion and aborts the process with SIGABRT.

The record

CVE
CVE-2025-69653
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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