| id: GO-2026-5030 |
| modules: |
| - module: golang.org/x/net |
| versions: |
| - fixed: 0.55.0 |
| vulnerable_at: 0.54.0 |
| packages: |
| - package: golang.org/x/net/html |
| symbols: |
| - parser.parse |
| derived_symbols: |
| - Parse |
| - ParseFragment |
| - ParseFragmentWithOptions |
| - ParseWithOptions |
| summary: Invoking duplicate attributes can cause XSS 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. |
| credits: |
| - ensy |
| references: |
| - report: https://go.dev/issue/79575 |
| - web: https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8 |
| - fix: https://go.dev/cl/781685 |
| cve_metadata: |
| id: CVE-2026-27136 |
| cwe: 'CWE-79: Improper Neutralization of Input During Web Page Generation (''Cross-site Scripting'')' |
| source: |
| id: go-security-team |
| review_status: REVIEWED |
