Description
Cross-site scripting (XSS) vulnerability in activesupport/lib/active_support/core_ext/string/output_safety.rb in Ruby on Rails 2.x before 2.3.13, 3.0.x before 3.0.10, and 3.1.x before 3.1.0.rc5 allows remote attackers to inject arbitrary web script or HTML via a malformed Unicode string, related to a "UTF-8 escaping vulnerability."
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rails | 2.3.14 | — |
| Debian 13 | rails | 2.3.14 | — |
| Debian 12 | rails | 2.3.14 | — |
| Debian 6.0 | rails | 2.3.5-1.2+squeeze8 | DSA-2655-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | activesupport | >= 2.0.0, < 2.3.13 | 2.3.13 | GHSA-9fh3-vh3h-q4g3 |
| RubyGems | activesupport | >= 3.0.0, < 3.0.10 | 3.0.10 | GHSA-9fh3-vh3h-q4g3 |
Advisories 1
- DSA-2655-1 rails - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://bugzilla.redhat.com/show_bug.cgi?id=731435
- 45917 third-party-advisory
- [oss-security] 20110817 CVE request: ruby on rails flaws (4) mailing-list
- FEDORA-2011-11579 vendor-advisory
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4) mailing-list
- FEDORA-2011-11600 vendor-advisory
- FEDORA-2011-11386 vendor-advisory
- [oss-security] 20110819 Re: CVE request: ruby on rails flaws (4) mailing-list
- [oss-security] 20110820 Re: CVE request: ruby on rails flaws (4) mailing-list
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4) mailing-list
- https://github.com/rails/rails/commit/bfc432574d0b141fd7fe759edfe9b6771dd306bd
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4) mailing-list
- [rubyonrails-security] 20110816 XSS Vulnerability in the escaping function in Ruby on Rails mailing-list
- http://weblog.rubyonrails.org/2011/8/16/ann-rails-3-1-0-rc6