CVE-2026-27136

MediumCVSS 6.1/10Last modified Jul 23, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-1021

Affected software

Vendor	Product	Versions
golang.org/x/net	golang.org/x/net/html	< 0.55.0

References

https://go.dev/cl/781685Issue Tracking
https://go.dev/issue/79575Issue Tracking
https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8Mailing List
https://pkg.go.dev/vuln/GO-2026-5030Vendor Advisory

Timeline

Published: May 22, 2026
Last modified: Jul 23, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-271377.5When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local porti CVE-2026-271385.9Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded n CVE-2026-271392.5On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file CVE-2026-27144.4The Institute Management plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Enquiry Form Title' setting in all versi CVE-2026-271408.8SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to tr CVE-2026-271417.5Due to missing nil check, sending 0x0a-0x0f HTTP/2 frames will cause a running server to panic CVE-2026-271426.1Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-CVE-2026-271439.8Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for CVE-2026-271447.1The compiler is meant to unwrap pointers which are the operands of a memory move; a no-op interface conversion prevented the compiler from m CVE-2026-271456.5(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caus CVE-2026-271464.5GetSimple CMS is a content management system. All versions of GetSimple CMS do not implement CSRF protection on the administrative file uplo CVE-2026-271475.4GetSimple CMS is a content management system. All versions of GetSimple CMS are vulnerable to XSS through SVG file uploads. Authenticated us