CVE-2026-6694: Gimp: gimp file-png plugin: denial of service via oversized apng trns chunk

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-03 · updated 2026-09-04
Weakness: CWE-120

Description

A flaw was found in GIMP's file-png plugin. A remote attacker can exploit this by crafting a malicious Animated Portable Network Graphics (APNG) image containing an oversized tRNS chunk. This can lead to a stack-based buffer overflow (CWE-121), causing the file-png plugin to crash and resulting in a Denial of Service (DoS) for the user.

Affected products

Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0

References

https://access.redhat.com/security/cve/CVE-2026-6694
https://bugzilla.redhat.com/show_bug.cgi?id=2459779

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