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CVE-2026-42500— Panic when reading out of bound palette index in golang.org/x/image/bmp

Quick assessment

Affected
golang.org/x/image golang.org/x/image/bmp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于解码调色板BMP文件时，如果使用超出范围的调色板索引访问无效图像中的像素，会导致程序崩溃。

AI Predicted 5.5 Difficulty: Easy EPSS 0.38% · P32

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
golang.org/x/image golang.org/x/image/bmp < 0.41.0 affected
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I. Basic Information for CVE-2026-42500

Vulnerability Information
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Vulnerability Title
Panic when reading out of bound palette index in golang.org/x/image/bmp
Source: CVE Program / CVE List V5
Vulnerability Description
Decoding a paletted BMP file with an out-of-range palette index results in a panic when accessing pixels in the invalid image.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于解码调色板BMP文件时，如果使用超出范围的调色板索引访问无效图像中的像素，会导致程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
golang.org/x/image golang.org/x/image/bmp 0 ~ 0.41.0 -

II. Public POCs for CVE-2026-42500

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III. Intelligence Information for CVE-2026-42500

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Patches & Fixes for CVE-2026-42500 (1)

Mailing List Discussions for CVE-2026-42500 (1)

Other References for CVE-2026-42500 (2)

IV. Related Vulnerabilities

Same vendor: golang.org/x/image

V. Comments for CVE-2026-42500

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