CVE-2026-30041Network attack vector

Code execution via unchecked PSD height overflow

Published Jun 26, 2026 · Updated Jun 26, 2026

Integer overflow in FastStone Image Viewer 8.3 and earlier allows attackers to execute code or crash the application through a crafted PSD file. The PSD parser fails to validate the image height before size calculation, causing integer wraparound and a heap-based buffer overflow that can overwrite the instruction pointer. Exploitation requires the application to process the file automatically or interactively; code runs with the current user's privileges, while denial of service leaves the application persistently crashed.

CVSS severity7.5
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in FastStone Image Viewer 8.3 and earlier allows attackers to execute code or crash the application through a crafted PSD file. The PSD parser fails to validate the image height before size calculation, causing integer wraparound and a heap-based buffer overflow that can overwrite the instruction pointer. Exploitation requires the application to process the file automatically or interactively; code runs with the current user's privileges, while denial of service leaves the application persistently crashed.

The record

CVE
CVE-2026-30041
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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