Is CVE-2026-18090 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18090?

CVE-2026-18090 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-18090

Description

A flaw was found in gdk-pixbuf. This vulnerability allows a remote attacker to cause a heap out-of-bounds read by providing a specially crafted Apple Icon Image (.icns) file. The uncompress() function, which handles RLE-encoded ICNS icon data, fails to validate the source buffer's boundaries during decompression. This can lead to a denial of service, where the application crashes, or to information disclosure, potentially revealing sensitive data from adjacent memory.