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In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.

CVE-2025-27220 is a vulnerability classified under CWE-1333, indicating inefficient regular expression complexity leading to a ReDoS attack vector. The flaw exists in the ruby-lang CGI gem, specifically in the Util#escapeElement method, which uses a regular expression that can be exploited by an attacker to cause excessive backtracking. When maliciously crafted input is processed by this method, the regular expression engine consumes disproportionate CPU resources, potentially leading to denial of service by exhausting server processing capacity. The affected versions are all releases prior to 0.4.2, including 0, 0.3.6, and 0.4.0. The vulnerability is remotely exploitable without authentication or user interaction, but the attack complexity is high due to the need to craft specific input patterns that trigger the inefficient regex behavior. The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L) reflects network attack vector, high attack complexity, no privileges or user interaction required, scope changed, no confidentiality or integrity impact, and low availability impact. No public exploits have been reported yet, but the vulnerability poses a risk to web applications relying on the CGI gem for input escaping. The issue was published on March 3, 2025, and no official patches are linked in the provided data, but upgrading to version 0.4.2 or later is recommended to remediate the vulnerability.

Detailed information about CVE-2025-27220: CWE-1333 Inefficient Regular Expression Complexity in ruby-lang CGI affecting ruby-lang CGI. Get real-time updates, t

CVE-2025-27220: CWE-1333 Inefficient Regular Expression Complexity in ruby-lang CGI - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-27220: CWE-1333 Inefficient Regular Expression Complexity in ruby-lang CGI

In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse method in the CGI library contains a potential Denial of Service (DoS) vulnerability. The method does not impose any limit on the length of the raw cookie value it processes. This oversight can lead to excessive resource consumption when parsing extremely large cookies.

CVE-2025-27219 is a resource exhaustion vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) found in the Ruby CGI gem prior to version 0.4.2. The flaw resides in the CGI::Cookie.parse method, which processes HTTP cookie headers without imposing any constraints on the length of the raw cookie value. An attacker can exploit this by sending an HTTP request with an excessively large cookie, causing the method to allocate and process large amounts of memory and CPU resources. This unchecked resource consumption can degrade server performance or cause the application to crash, resulting in a Denial of Service (DoS) condition. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS v3.1 score is 5.8 (medium severity), reflecting the network attack vector, low attack complexity, no privileges required, and no user interaction, but limited to availability impact only. No patches were available at the time of disclosure, so mitigation relies on monitoring and limiting request sizes at the application or web server level. The vulnerability affects Ruby CGI gem versions 0, 0.3.6, and 0.4.0, which are used in web applications that handle HTTP cookies via Ruby’s CGI library.

Detailed information about CVE-2025-27219: CWE-770 Allocation of Resources Without Limits or Throttling in ruby-lang CGI affecting ruby-lang CGI. Get real-time 

CVE-2025-27219: CWE-770 Allocation of Resources Without Limits or Throttling in ruby-lang CGI - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-27219: CWE-770 Allocation of Resources Without Limits or Throttling in ruby-lang CGI


CVE-2025-27220: CWE-1333 Inefficient Regular Expression Complexity in ruby-lang CGICVE-2025-27220 0 In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method. MediumVulnerabilityGermanyFranceUnited Kingdom+2#cve #cve-2025-27220 #cwe-1333 Join the discussion	CVE Database V5	03/03/2025, 00:00:00 UTC Added: 11/03/2025, 21:26:48 UTC
CVE-2025-27219: CWE-770 Allocation of Resources Without Limits or Throttling in ruby-lang CGICVE-2025-27219 0 In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse method in the CGI library contains a potential Denial of Service (DoS) vulnerability. The method does not impose any limit on the length of the raw cookie value it processes. This oversight can lead to excessive resource consumption when parsing extremely large cookies. MediumVulnerabilityUnited KingdomGermanyFrance+5#cve #cve-2025-27219 #cwe-770 Join the discussion	CVE Database V5	03/03/2025, 00:00:00 UTC Added: 11/03/2025, 21:26:48 UTC

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