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.

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.

EPSS: 0.001 (16.4th percentile) — read the EPSS interpretation.

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.

Affected products

Golang.org/x/image Golang.org/x/image/bmp — versions 0

References

security@golang.org
security@golang.org
security@golang.org
security@golang.org

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.