CVE-2023-31908Public exploit

Heap corruption via oversized typed-array sort

Published May 10, 2023 · Updated Jan 28, 2025

Out-of-bounds write in JerryScript 3.0 allows local users to corrupt heap memory by sorting an oversized Int16Array. For an Int16Array length of 1,073,741,825, ecma_builtin_typedarray_prototype_sort allocates a four-byte temporary buffer and writes a four-byte element immediately past it. Crafted JavaScript must be executed; the published test aborts under AddressSanitizer or hits a debug assertion, and arbitrary code execution is not demonstrated.

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

Out-of-bounds write in JerryScript 3.0 allows local users to corrupt heap memory by sorting an oversized Int16Array. For an Int16Array length of 1,073,741,825, ecma_builtin_typedarray_prototype_sort allocates a four-byte temporary buffer and writes a four-byte element immediately past it. Crafted JavaScript must be executed; the published test aborts under AddressSanitizer or hits a debug assertion, and arbitrary code execution is not demonstrated.

The record

CVE
CVE-2023-31908
Published
May 10, 2023
Updated
Jan 28, 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 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
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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