CVE-2026-66759Public exploitHinoki check available

Heap disclosure or crash via truncated ICNS mask

Published Jul 27, 2026 · Updated Jul 27, 2026

Out-of-bounds read in GIMP on Red Hat Enterprise Linux 8 and 9 allows attackers to disclose heap data or crash GIMP via crafted ICNS images. The file-icns plugin's icns_decompress function advances through a truncated mask resource without checking the cursor against the allocated buffer and emits read heap bytes as alpha values. Exploitation requires a user to process the malicious image; impact is limited to heap-content disclosure or an application crash.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Out-of-bounds read in GIMP on Red Hat Enterprise Linux 8 and 9 allows attackers to disclose heap data or crash GIMP via crafted ICNS images. The file-icns plugin's icns_decompress function advances through a truncated mask resource without checking the cursor against the allocated buffer and emits read heap bytes as alpha values. Exploitation requires a user to process the malicious image; impact is limited to heap-content disclosure or an application crash.

The record

CVE
CVE-2026-66759
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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 versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.1Red HatCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/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 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-125Out-of-bounds Read
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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