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CVE-2026-27136 Moderate

Invoking duplicate attributes can cause XSS in golang.org/x/net/html

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.

Exploit probability 0.2%
Published May 22, 2026
Required by Not available
Last source change August 12, 2026

02 / AFFECTED SOFTWARE

Affected packages

Go golang.org/x/net
Unknown Unknown

54 explicit affected versions

03 / CONNECTIONS

Connected vulnerabilities

related OPENSUSE-SU-2026:21483-1

04 / EVIDENCE

Source records

Open Source Vulnerabilities GO-2026-5030

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.

View original source
Open Source Vulnerabilities CVE-2026-27136

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.

View original source

05 / REFERENCES

Further evidence