CVE-2023-26974Public exploit

Application crash via JPEG 2000 out-of-bounds write

Published Apr 4, 2023 · Updated Feb 13, 2025

Memory corruption in IrfanView 4.62 allows attackers to crash the application when a user opens a crafted JPEG 2000 file. In the 32-bit JPEG2000.dll 4.56.0.0 decoder, a loop advances a destination pointer by two bytes for 32 iterations and writes a byte after the allocated buffer ends. Exploitation requires user interaction with the malicious file and produces a user-mode access violation and denial of service, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in IrfanView 4.62 allows attackers to crash the application when a user opens a crafted JPEG 2000 file. In the 32-bit JPEG2000.dll 4.56.0.0 decoder, a loop advances a destination pointer by two bytes for 32 iterations and writes a byte after the allocated buffer ends. Exploitation requires user interaction with the malicious file and produces a user-mode access violation and denial of service, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2023-26974
Published
Apr 4, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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

5.5NIST NVDCVSS: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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation
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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