From 525bd6403065ae352df76fb8f2312b3e2855fd48 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Wed, 26 Feb 2025 16:43:49 +0900
Subject: [PATCH] Security advisories: CVE-2025-27219, CVE-2025-27220 and
 CVE-2025-2722

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+---
+layout: news_post
+title: "Security advisories: CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221"
+author: "hsbt"
+translator:
+date: 2025-02-26 07:00:00 +0000
+tags: security
+lang: en
+---
+
+We published security advisories for CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221. Please read the details below.
+
+## CVE-2025-27219: Denial of Service in `CGI::Cookie.parse`.
+
+There is a possibility for DoS by in the cgi gem.  This vulnerability has been assigned the CVE identifier [CVE-2025-27219](https://www.cve.org/CVERecord?id=CVE-2025-27219). We recommend upgrading the cgi gem.
+
+### Details
+
+`CGI::Cookie.parse` took super-linear time to parse a cookie string in some cases. Feeding a maliciously crafted cookie string into the method could lead to a Denial of Service.
+
+Please update CGI gem to version 0.3.5.1, 0.3.7, 0.4.2 or later.
+
+### Affected versions
+
+* cgi gem versions <= 0.3.5, 0.3.6, 0.4.0 and 0.4.1.
+
+### Credits
+
+Thanks to [lio346](https://hackerone.com/lio346) for discovering this issue. Also thanks to [mame](https://github.com/mame) for fixing this vulnerability.
+
+## CVE-2025-27220: ReDoS in `CGI::Util#escapeElement`.
+
+There is a possibility for Regular expression Denial of Service(ReDoS) by in the cgi gem.  This vulnerability has been assigned the CVE identifier [CVE-2025-27220](https://www.cve.org/CVERecord?id=CVE-2025-27220). We recommend upgrading the cgi gem.
+
+### Details
+
+The regular expression used in `CGI::Util#escapeElement` is vulnerable to ReDoS. The crafted input could lead to a high CPU consumption.
+
+This vulnerability only affects Ruby 3.1 and 3.2. If you are using these versions, please update CGI gem to version 0.3.5.1, 0.3.7, 0.4.2 or later.
+
+### Affected versions
+
+* cgi gem versions <= 0.3.5, 0.3.6, 0.4.0 and 0.4.1.
+
+### Credits
+
+Thanks to [svalkanov](https://hackerone.com/svalkanov) for discovering this issue. Also thanks to [nobu](https://github.com/nobu) for fixing this vulnerability.
+
+
+## CVE-2025-27221: userinfo leakage in `URI#join`, `URI#merge` and `URI#+`.
+
+There is a possibility for userinfo leakage by in the uri gem.  This vulnerability has been assigned the CVE identifier [CVE-2025-27221](https://www.cve.org/CVERecord?id=CVE-2025-27221). We recommend upgrading the uri gem.
+
+### Details
+
+The methods `URI#join`, `URI#merge`, and `URI#+` retained userinfo, such as `user:password`, even after the host is replaced. When generating a URL to a malicious host from a URL containing secret userinfo using these methods, and having someone access that URL, an unintended userinfo leak could occur.
+
+Please update URI gem to version 0.11.3, 0.12.4, 0.13.2, 1.0.3 or later.
+
+### Affected versions
+
+* uri gem versions < 0.11.3, 0.12.0 to 0.12.3, 0.13.0, 0.13.1 and 1.0.0 to 1.0.2.
+
+### Credits
+
+Thanks to [Tsubasa Irisawa (lambdasawa)](https://hackerone.com/lambdasawa) for discovering this issue. Also thanks to [nobu](https://github.com/nobu) for additional fixes of this vulnerability.
+
+## History
+
+* Originally published at 2025-02-26 7:00:00 (UTC)