CVE-2023-31919Public exploit

Process crash via nested exception assertion

Published May 12, 2023 · Updated Jan 24, 2025

Reachable assertion in JerryScript 3.0 allows local users to crash an embedding process by supplying crafted JavaScript. A Proxy-based RegExp matchAll call reaches invalid-flag handling with an exception already pending, and jcontext_raise_exception raises another error despite its no-pending-exception assertion. Execution requires crafted script input and aborts the hosting process, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
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

Reachable assertion in JerryScript 3.0 allows local users to crash an embedding process by supplying crafted JavaScript. A Proxy-based RegExp matchAll call reaches invalid-flag handling with an exception already pending, and jcontext_raise_exception raises another error despite its no-pending-exception assertion. Execution requires crafted script input and aborts the hosting process, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2023-31919
Published
May 12, 2023
Updated
Jan 24, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1204
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/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.

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1204User 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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