Panic when reading out of bound palette index in golang.org/x/image/bmp

MEDIUM 5.3CVE-2026-42500 · GO-2026-5031 · Published 29/05/2026 · updated 22/07/2026

In short

CVE-2026-42500 is a MEDIUM (CVSS 5.3) vulnerability affecting golang.org/x/image.
Chance of exploitation in the next 30 days (EPSS): 0.38%, higher than 32.5% of all vulnerabilities.
Fix: update to 0.41.0 or later.

Package	Affected versions	Patched versions
golang.org/x/image Go	`< 0.41.0`	`0.41.0`

Decoding a paletted BMP file with an out-of-range palette index results in a panic when accessing pixels in the invalid image.

NVD description

Decoding a paletted BMP file with an out-of-range palette index results in a panic when accessing pixels in the invalid image.

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Package

Affected versions

Patched versions

< 0.41.0

0.41.0

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