CVE-2023-31910Public exploit

Process crash via parser heap out-of-bounds read

Published May 10, 2023 · Updated Jan 28, 2025

Heap-buffer overflow in JerryScript 3.0.0 allows local users to crash the engine by supplying crafted JavaScript for parsing. In parser_parse_function_statement at js-parser-statm.c:696, malformed static-block syntax drives a two-byte read four bytes before an eight-byte heap allocation. Exploitation requires the engine to parse attacker-controlled source with user interaction; the public reproducer demonstrates an abort, not code execution.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in JerryScript 3.0.0 allows local users to crash the engine by supplying crafted JavaScript for parsing. In parser_parse_function_statement at js-parser-statm.c:696, malformed static-block syntax drives a two-byte read four bytes before an eight-byte heap allocation. Exploitation requires the engine to parse attacker-controlled source with user interaction; the public reproducer demonstrates an abort, not code execution.

The record

CVE
CVE-2023-31910
Published
May 10, 2023
Updated
Jan 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/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)
Vectorlocal
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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