CVE-2026-42506

MEDIUM

Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/html

Title source: cna

Description

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

References (4)

Core 4

Core References

https://go.dev/issue/79571

https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8

https://go.dev/cl/781700

https://pkg.go.dev/vuln/GO-2026-5025

Scores

CVSS v3 6.1

EPSS 0.0025

EPSS Percentile 15.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (2)

golang/net < 0.55.0

golang.org/x/net/golang.org/x/net/html < 0.55.0

Published May 22, 2026

Tracked Since May 22, 2026