High [CVE-2026-18309] Remote Code Execution via APNG file parsing integer overflow
This high-severity Red Hat Linux advisory covers CVE-2026-18309 affecting Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP.
User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of APNG files.
The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.
Was ZDI-CAN-29401. A flaw was found in GIMP.
Successful exploitation requires user interaction, such as opening a malicious file. Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-190. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE.
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 48 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 48 minutes ago·verify at source
Mitigation checklist
- To mitigate this issue, users should exercise caution and avoid opening APNG image files from untrusted or suspicious sources. Additionally, running GIMP within a sandboxed environment, such as a Flatpak, can help limit the potential impact of successful exploitation by restricting access to system resources.
Official advisory · high-confidence parse· fetched 48 minutes ago·verify at source
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