CVE-2022-44789Public exploitNetwork attack vector

Code execution via property-descriptor use-after-free

Published Nov 23, 2022 · Updated Apr 25, 2025

Use-after-free in Artifex MuJS 1.0.0 through 1.3.x before 1.3.2 allows attackers to execute code by loading crafted JavaScript. O_getOwnPropertyDescriptor() builds descriptor fields with prototype-aware property assignment, which invokes an Object.prototype setter that can delete the property being processed and leave ref pointing to freed heap memory. Execution requires the crafted file to be loaded by an affected interpreter; the published exploit turns the dangling setter pointer into memory primitives and code execution on a glibc-based Linux build.

CVSS severity8.8
High
EPSS probability2.34%
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 Artifex MuJS 1.0.0 through 1.3.x before 1.3.2 allows attackers to execute code by loading crafted JavaScript. O_getOwnPropertyDescriptor() builds descriptor fields with prototype-aware property assignment, which invokes an Object.prototype setter that can delete the property being processed and leave ref pointing to freed heap memory. Execution requires the crafted file to be loaded by an affected interpreter; the published exploit turns the dangling setter pointer into memory primitives and code execution on a glibc-based Linux build.

The record

CVE
CVE-2022-44789
Published
Nov 23, 2022
Updated
Apr 25, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 2025Record 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

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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