CVE-2023-31907Public exploit

Engine crash via out-of-bounds parser read

Published May 10, 2023 · Updated Jan 27, 2025

Heap-buffer overflow in JerryScript 3.0.0 allows context-dependent attackers to crash the engine with crafted JavaScript source. The scanner_literal_is_created function reads two bytes beyond a heap allocation while parser_parse_var_statement processes crafted class syntax. Execution requires a user or embedding application to parse attacker-controlled JavaScript; the public reproducer triggers an AddressSanitizer abort.

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 context-dependent attackers to crash the engine with crafted JavaScript source. The scanner_literal_is_created function reads two bytes beyond a heap allocation while parser_parse_var_statement processes crafted class syntax. Execution requires a user or embedding application to parse attacker-controlled JavaScript; the public reproducer triggers an AddressSanitizer abort.

The record

CVE
CVE-2023-31907
Published
May 10, 2023
Updated
Jan 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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
T1204.002Malicious File

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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