Bug 2566592 (CVE-2026-120631)

Summary: CVE-2026-120631 perl-cgi: perl-cgi: Denial of Service via unescaped cookie expiration attribute
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in perl-cgi. A remote attacker can cause a Denial of Service (DoS) by sending an HTTP request with a specially crafted Cookie header containing a malformed expiration attribute. Because the cookie parser inserts this unescaped value directly into an internal regular expression (a pattern-matching rule), the input can cause the application to crash or become unresponsive due to excessive processing time.
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Description OSIDB Bzimport 2026-11-03 23:51:21 UTC 
CGI::Cookie versions from 4.67 before 5.00 for Perl allow denial of service via the client cookie expires value used as a regex in parse.

CGI's cookie method reads the Cookie request header through parse, which interpolates the header's expires value unescaped into the substitution pattern that removes it from the cookie string.

A client can make the request die with an invalid pattern, or tie up the process with one that backtracks catastrophically.