CVE-2023-48184Public exploit

Process crash via async-closure garbage collection

Published Apr 23, 2024 · Updated Aug 2, 2024

Use-after-free in QuickJS before 7414e5f allows context-dependent attackers to crash the host process via crafted JavaScript. The cycle collector frees an async closure object that remains reachable, and JS_FreeValueRT later reads its released reference. Exploitation requires a host to execute the crafted script; the public reproducer demonstrates a heap read-after-free and process termination.

CVSS severity3.9
Low
EPSS probability0.34%
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 before 7414e5f allows context-dependent attackers to crash the host process via crafted JavaScript. The cycle collector frees an async closure object that remains reachable, and JS_FreeValueRT later reads its released reference. Exploitation requires a host to execute the crafted script; the public reproducer demonstrates a heap read-after-free and process termination.

The record

CVE
CVE-2023-48184
Published
Apr 23, 2024
Updated
Aug 2, 2024
Vendor
Fabrice Bellard
Product
QuickJS
Classifications
CWE-416, T1203
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Fabrice Bellard · QuickJSversion=-

Published CVSS scores

3.9CISA-ADPCVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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