CVE-2026-78465Public exploit

Code execution via undersized PCX heap allocation

Published Aug 24, 2026 · Updated Aug 25, 2026

Heap-based buffer overflow in GNOME GIMP's file-pcx plugin allows context-dependent attackers to execute code via crafted PCX files. On 32-bit builds, four color planes and sufficiently large dimensions overflow allocation-size arithmetic, leaving a heap buffer smaller than the decoded image data written into it. Exploitation requires a user to open the file and can execute code in that user's session or crash GIMP.

CVSS severity7.0
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in GNOME GIMP's file-pcx plugin allows context-dependent attackers to execute code via crafted PCX files. On 32-bit builds, four color planes and sufficiently large dimensions overflow allocation-size arithmetic, leaving a heap buffer smaller than the decoded image data written into it. Exploitation requires a user to open the file and can execute code in that user's session or crash GIMP.

The record

CVE
CVE-2026-78465
Published
Aug 24, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1204.002User Execution: Malicious 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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