Out-of-Range Palette Index Vulnerability in Go Programming Language
CVE-2026-42500

5.3MEDIUM

Key Information:

Vendor

Golang.org/x/image

Status
Golang.org/x/image/bmp
Vendor
CVE Published:
29 May 2026

What is CVE-2026-42500?

This vulnerability occurs when an application processes a paletted BMP file. If the palette index used to decode the file is out of range, it results in a panic during the pixel access of the invalid image. This can lead to potential crashes or unexpected behavior in applications that rely on image processing in the Go programming language.

Affected Version(s)

golang.org/x/image/bmp 0 < 0.41.0

References

https://go.dev/issue/79576
https://groups.google.com/g/golang-announce/c/uhYX90BlBvI
https://go.dev/cl/781500

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.