CVE-2024-33263Public exploit

Interpreter crash via runtime teardown assertion

Published Apr 26, 2024 · Updated Nov 21, 2024

Reachable assertion in QuickJS on Ubuntu 10.04 allows local users to crash the interpreter with a crafted JavaScript program. The nested-Proxy test reaches a TypeError, leaves the runtime garbage-collection object list nonempty, and triggers the list_empty assertion in JS_FreeRuntime. Execution of attacker-controlled JavaScript is required; the demonstrated result is an abort of the QuickJS process, not a system-wide shutdown.

CVSS severity4.0
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in QuickJS on Ubuntu 10.04 allows local users to crash the interpreter with a crafted JavaScript program. The nested-Proxy test reaches a TypeError, leaves the runtime garbage-collection object list nonempty, and triggers the list_empty assertion in JS_FreeRuntime. Execution of attacker-controlled JavaScript is required; the demonstrated result is an abort of the QuickJS process, not a system-wide shutdown.

The record

CVE
CVE-2024-33263
Published
Apr 26, 2024
Updated
Nov 21, 2024
Vendor
Canonical
Product
Ubuntu
Classifications
CWE-617, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 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=10.04

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Canonical · Ubuntuversion=10.04

Published CVSS scores

4.0CanonicalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

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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