Vulnerability in Golang.org/x/image Golang.org/x/image/bmp

CVE-2026-42500

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

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (42.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-42500: held from 0.004 to 0.005.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

References

Frequently asked questions

What is CVE-2026-42500?
CVE-2026-42500 is a medium-severity vulnerability in Golang.org/x/image Golang.org/x/image/bmp, classified under CWE-129: IMPROPER VALIDATION OF ARRAY INDEX. CVSS score: 5.3/10. Published 2026-05-29.
How severe is CVE-2026-42500?
Medium severity. CVSS v3 base score is 5.3 out of 10.