CVE-2026-18300Hinoki check available

Code execution via HDR allocation overflow

Published Aug 20, 2026 · Updated Aug 21, 2026

Integer overflow in HDR parsing in GIMP 3.2.2 allows remote attackers to execute arbitrary code via a crafted HDR image file. The HDR parser does not validate user-supplied size values before computing the allocation length, so the arithmetic can wrap before memory is reserved for decoded image data. Exploitation requires a user to open a malicious file or visit content that causes GIMP to process one, and any code runs in the current process context.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in HDR parsing in GIMP 3.2.2 allows remote attackers to execute arbitrary code via a crafted HDR image file. The HDR parser does not validate user-supplied size values before computing the allocation length, so the arithmetic can wrap before memory is reserved for decoded image data. Exploitation requires a user to open a malicious file or visit content that causes GIMP to process one, and any code runs in the current process context.

The record

CVE
CVE-2026-18300
Published
Aug 20, 2026
Updated
Aug 21, 2026
Vendor
GIMP
Product
GIMP
Classifications
CWE-190, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GIMP · GIMPversion=3.2.2

Published CVSS scores

7.8ZDICVSS:3.0/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
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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