CVE-2026-42506
Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/html
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.
INFO
Published Date :
May 22, 2026, 3:01 p.m.
Last Modified :
May 22, 2026, 3:01 p.m.
Remotely Exploit :
No
Source :
Go
Affected Products
The following products are affected by CVE-2026-42506
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Sanitize all HTML input before rendering.
- Update the rendering engine.
- Review input validation logic.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42506 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42506 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 22, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N -
New CVE Received by [email protected]
May. 22, 2026
Action Type Old Value New Value Added 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. Added Reference https://go.dev/cl/781700 Added Reference https://go.dev/issue/79571 Added Reference https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8 Added Reference https://pkg.go.dev/vuln/GO-2026-5025