CVE-2026-33170

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-33170
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created buffer. If a `SafeBuffer` is mutated in place (e.g. via `gsub!`) and then formatted with `%` using untrusted arguments, the result incorrectly reports `html_safe? == true`, bypassing ERB auto-escaping and possibly leading to XSS. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

6.1 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7 Patch
https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db Patch
https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb Patch
https://github.com/rails/rails/releases/tag/v7.2.3.1 Release Notes
https://github.com/rails/rails/releases/tag/v8.0.4.1 Release Notes
https://github.com/rails/rails/releases/tag/v8.1.2.1 Release Notes
https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
History

24 Mar 2026, 18:00

Type Values Removed Values Added
CPE cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.1
References () https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7 - () https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7 - Patch
References () https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db - () https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db - Patch
References () https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb - () https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb - Patch
References () https://github.com/rails/rails/releases/tag/v7.2.3.1 - () https://github.com/rails/rails/releases/tag/v7.2.3.1 - Release Notes
References () https://github.com/rails/rails/releases/tag/v8.0.4.1 - () https://github.com/rails/rails/releases/tag/v8.0.4.1 - Release Notes
References () https://github.com/rails/rails/releases/tag/v8.1.2.1 - () https://github.com/rails/rails/releases/tag/v8.1.2.1 - Release Notes
References () https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v - () https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v - Vendor Advisory
First Time Rubyonrails
Rubyonrails rails
Summary
  • (es) Active Support es un conjunto de herramientas de bibliotecas de soporte y extensiones del núcleo de Ruby extraídas del framework de Rails. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, 'SafeBuffer#%' no propaga el flag '@html_unsafe' al búfer recién creado. Si un 'SafeBuffer' es mutado in situ (p. ej., a través de 'gsub!') y luego formateado con '%' usando argumentos no confiables, el resultado informa incorrectamente que 'html_safe? == true', omitiendo el auto-escapado de ERB y posiblemente llevando a XSS. Las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1 contienen un parche.

24 Mar 2026, 00:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-24 00:16

Updated : 2026-03-24 18:00

NVD link : CVE-2026-33170

Mitre link : CVE-2026-33170

CVE.ORG link : CVE-2026-33170

JSON object : View

Products Affected

rubyonrails

  • rails
CWE
CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')