CVE-2025-27219

EUVD-2025-5556
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.8 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
mitreCNA
5.8 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 73%
Affected Products (NVD)
VendorProductVersion
ruby-langcgi
𝑥
< 0.3.5.1
ruby-langcgi
0.4.0 ≤
𝑥
< 0.4.2
ruby-langcgi
0.3.6
𝑥
= Vulnerable software versions
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
ruby2.3
focal
dne
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
xenial
Fixed 2.3.1-2~ubuntu16.04.16+esm10
released
ruby2.5
bionic
Fixed 2.5.1-1ubuntu1.16+esm4
released
focal
dne
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
ruby2.7
focal
Fixed 2.7.0-5ubuntu1.18
released
jammy
dne
noble
dne
oracular
dne
plucky
dne
questing
dne
ruby3.0
focal
dne
jammy
Fixed 3.0.2-7ubuntu2.10
released
noble
dne
oracular
dne
plucky
dne
questing
dne
ruby3.2
focal
dne
jammy
dne
noble
Fixed 3.2.3-1ubuntu0.24.04.5
released
oracular
dne
plucky
dne
questing
dne
ruby3.3
focal
dne
jammy
dne
noble
dne
oracular
Fixed 3.3.4-2ubuntu5.2
released
plucky
Fixed 3.3.7-1ubuntu2
released
questing
Fixed 3.3.7-1ubuntu2
released
jruby
bionic
needs-triage
focal
needs-triage
jammy
dne
noble
needs-triage
oracular
ignored
plucky
ignored
questing
needs-triage
trusty
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27219.yml
https://hackerone.com/reports/2936778
https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html