What is CVE-2026-42506?

CVE-2026-42506 is a medium-severity vulnerability in Golang Net, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-22.

How severe is CVE-2026-42506?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Golang Net

CVE-2026-42506

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (9.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Golang Net
Golang.org/x/net Golang.org/x/net/html — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@golang.org (Issue Tracking)
security@golang.org (Mailing List)
security@golang.org (Issue Tracking)
security@golang.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-42506?: CVE-2026-42506 is a medium-severity vulnerability in Golang Net, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-22.
How severe is CVE-2026-42506?: Medium severity. CVSS v3 base score is 6.1 out of 10.