High [CVE-2026-66759] out-of-bounds read in file-icns plugin causes information disclosure or crash on crafted ICNS images
This high-severity Red Hat Linux advisory covers CVE-2026-66759 affecting Red Hat Enterprise Linux 9, Red Hat package: gimp.
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Summary
A flaw was found in the file-icns plugin in GIMP. When applying a decompressed mask during ICNS image processing, the plugin reads from the mask data buffer without verifying if the cursor exceeds the allocated resource size.
If a crafted file contains a truncated mask resource, the icns_decompress function continues reading past the bounds of the buffer. This out-of-bounds read vulnerability results in information disclosure of heap contents, where memory contents are leaked as alpha channel pixel values, or a crash leading to a denial of service if unmapped memory is accessed.
To exploit this vulnerability, an attacker needs to convince a user to process a specially crafted ICNS image with GIMP, reducing the likelihood of exploitation. Due to this reason, this flaw has been rated with a moderate severity.
Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:50817.
Affected products named by the advisory: Red Hat package: gimp.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
- gimp-2:3.0.4-4.el9_8.9
- RHSA-2026:50817
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, do not open ICNS files from untrusted sources with GIMP.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
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