CGI has Denial of Service (DoS) potential in Cookie.parse
There is a possibility for DoS by in the cgi gem. This vulnerability has been assigned the CVE identifier 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 for discovering this issue. Also thanks to mame for fixing this vulnerability.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-27219US | high7.5 | — | ||
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 lim… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/ruby/cgiPACKAGE
- https://github.com/ruby/cgi/pull/52WEB
- https://github.com/ruby/cgi/pull/53WEB
- https://github.com/ruby/cgi/pull/54WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27219.ymlWEB
- https://hackerone.com/reports/2936778WEB
- https://lists.debian.org/debian-lts-announce/2025/03/msg00008.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-27219ADVISORY
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