CVE-2026-27136: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in golang.org/x/net 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.
AI Analysis
Technical Summary
The vulnerability in golang.org/x/net/html involves improper neutralization of input during web page generation (CWE-79). Specifically, parsing arbitrary HTML and rendering it with the Render function can produce an unexpected HTML structure. Applications relying on this package for sanitizing HTML input may be vulnerable to XSS attacks if they trust the output without additional validation or sanitization.
Potential Impact
Exploitation of this vulnerability can lead to cross-site scripting attacks, enabling attackers to execute arbitrary scripts in the context of the affected application. This can compromise user data, session tokens, or perform actions on behalf of users. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, users should avoid relying solely on this package for HTML sanitization or implement additional sanitization layers to mitigate potential XSS risks.
CVE-2026-27136: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in golang.org/x/net 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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in golang.org/x/net/html involves improper neutralization of input during web page generation (CWE-79). Specifically, parsing arbitrary HTML and rendering it with the Render function can produce an unexpected HTML structure. Applications relying on this package for sanitizing HTML input may be vulnerable to XSS attacks if they trust the output without additional validation or sanitization.
Potential Impact
Exploitation of this vulnerability can lead to cross-site scripting attacks, enabling attackers to execute arbitrary scripts in the context of the affected application. This can compromise user data, session tokens, or perform actions on behalf of users. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, users should avoid relying solely on this package for HTML sanitization or implement additional sanitization layers to mitigate potential XSS risks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Go
- Date Reserved
- 2026-02-17T19:57:28.434Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1079f0e1370fbb48159daa
Added to database: 5/22/2026, 3:44:48 PM
Last enriched: 5/22/2026, 4:00:48 PM
Last updated: 5/23/2026, 7:58:12 PM
Views: 7
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