High [CVE-2026-42169] GIMP APNG loader heap-buffer-overflow when fcTL width exceeds IHDR width (file-png.c)
This high-severity Red Hat Linux advisory covers CVE-2026-42169 affecting Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat package: gimp.
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Summary
A heap-buffer-overflow vulnerability exists in the APNG (Animated PNG) file loader of GIMP. This flaw occurs when the `fcTL` width exceeds the `IHDR` width, leading to pixel data being written past the end of a heap allocation.
Additionally, a heap-based buffer overflow exists in the DDS plug-in due to a BPP mismatch in the `load_layer()` function. Both vulnerabilities can be triggered by opening a specially crafted image file, potentially leading to code execution.
This vulnerability in GIMP's APNG loader and DDS plug-in could lead to a heap-buffer-overflow when processing specially crafted image files. Exploitation requires a user to open a malicious APNG or DDS image.
Red Hat products shipping GIMP are affected if users are exposed to untrusted image files. Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-131. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8 as not affected. Red Hat fixing advisory: RHSA-2026:50817, RHSA-2026:73768.
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 24 days ago·verify at source
- gimp-2:3.0.4-4.el9_8.9
- gimp-2:2.99.8-4.el9_6.20
- RHSA-2026:50817
- RHSA-2026:73768
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
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