Skip to content
Fencer Vulns
high 7.5

CVE-2025-59830 json

Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters

published 2025-09-25 13 mo ago modified 2026-10-19 20 d ago also EUVD-2025-31103 , GHSA-625h-95r8-8xpm

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.

Patch / fix

  • rubygems rack 2.2.18
  • rack rack 2.2.18
  • rack_project rack 2.2.18
  • ruby-rack Debian 12 2.2.20-0+deb12u1
  • ruby-rack Debian 14, Debian 13 3.0.8-2

debian advisories DEBIAN-CVE-2025-59830

  • ruby-rack Ubuntu 22.04 LTS 2.1.4-5ubuntu1.2
  • ruby-rack Ubuntu 24.04 LTS 2.2.7-1ubuntu0.4
  • ruby-rack Ubuntu Pro 20.04 LTS 2.0.7-2ubuntu0.1+esm8

ubuntu advisories UBUNTU-CVE-2025-59830

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pcs RHEL 10.1 0.12.1-1.el10_1.1
  • pcs-snmp RHEL 10.1 0.12.1-1.el10_1.1
  • cockpit-ha-cluster RHEL 10.1 0.12.1-1.el10_1.1
  • pcs RHEL 9 0.11.10-1.el9_7.1
  • pcs-snmp RHEL 9 0.11.10-1.el9_7.1
  • foreman satellite utils 6.15, satellite capsule 6.15, satellite 6.15 3.9.1.13-1.el8sat
  • foreman-cli satellite utils 6.15, satellite 6.15 3.9.1.13-1.el8sat
  • foreman-ec2 satellite 6.15 3.9.1.13-1.el8sat

red hat advisories RHSA-2025:21036RHSA-2025:20962RHSA-2025:19948RHSA-2025:19856RHSA-2025:19855RHSA-2025:19800

  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.22-1.1
  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.18-1.1

opensuse advisories openSUSE-SU-2026:10286-1openSUSE-SU-2025:15587-1

  • pcs AlmaLinux 9 0.11.10-1.el9_7.1
  • pcs-snmp AlmaLinux 9 0.11.10-1.el9_7.1
  • cockpit-ha-cluster AlmaLinux 10 0.12.1-1.el10_1.1
  • pcs AlmaLinux 8 0.10.18-2.el8_10.7.alma.1
  • pcs-snmp AlmaLinux 8 0.10.18-2.el8_10.7.alma.1

almalinux advisories ALSA-2025:20962ALSA-2025:21036ALSA-2025:19719

  • pcs Rocky Linux 9 0.11.10-1.el9_7.1
  • pcs Rocky Linux 9 0.11.9-2.el9_6.2
  • pcs Rocky Linux 8 0.10.18-2.el8_10.7

rocky linux advisories RLSA-2025:20962RLSA-2025:19512RLSA-2025:19719

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-59830 updated cvss 7.5

rubygem-rack: Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters

  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/pilot-rhel8, openshift-service-mesh/grafana-rhel8, openshift-service-mesh/proxyv2-rhel9, openshift-service-mesh/istio-cni-rhel8, openshift-service-mesh/ratelimit-rhel8, openshift-service-mesh/istio-rhel8-operator, +2 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat 3scale API Management Platform 2 3scale-amp21/zync, 3scale-amp22/zync, 3scale-amp24/zync, 3scale-amp25/zync, 3scale-amp26/zync, 3scale-amp2/zync-rhel7, +2 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux High Availability (v. 9) pcs 0.11.9-2.el9_6.2, pcs 0.11.10-1.el9_7.1, pcs-snmp 0.11.9-2.el9_6.2, pcs-snmp 0.11.10-1.el9_7.1
    fixed: vendor fix RHSA-2025:19512
  • Red Hat Enterprise Linux High Availability (v. 10) pcs 0.12.0-3.el10_0.3, pcs 0.12.1-1.el10_1.1, pcs-snmp 0.12.0-3.el10_0.3, pcs-snmp 0.12.1-1.el10_1.1, cockpit-ha-cluster 0.12.0-3.el10_0.3, cockpit-ha-cluster 0.12.1-1.el10_1.1
    fixed: vendor fix RHSA-2025:19513
  • Red Hat Enterprise Linux High Availability AUS (v.8.4) pcs 0.10.8-1.el8_4.8, pcs-snmp 0.10.8-1.el8_4.8
    fixed: vendor fix RHSA-2025:19948
  • Red Hat Enterprise Linux High Availability E4S (v.8.6) pcs 0.10.12-6.el8_6.10, pcs-snmp 0.10.12-6.el8_6.10
    fixed: vendor fix RHSA-2025:19734
  • Red Hat Enterprise Linux High Availability E4S (v.8.8) pcs 0.10.15-4.el8_8.9, pcs-snmp 0.10.15-4.el8_8.9
    fixed: vendor fix RHSA-2025:19647
  • Red Hat Enterprise Linux High Availability E4S (v.9.0) pcs 0.11.1-10.el9_0.9, pcs-snmp 0.11.1-10.el9_0.9
    fixed: vendor fix RHSA-2025:19800
show 17 more
  • Red Hat Enterprise Linux High Availability E4S (v.9.2) pcs 0.11.4-7.el9_2.6, pcs-snmp 0.11.4-7.el9_2.6
    fixed: vendor fix RHSA-2025:19733
  • Red Hat Enterprise Linux High Availability EUS (v.9.4) pcs 0.11.7-2.el9_4.5, pcs-snmp 0.11.7-2.el9_4.5
    fixed: vendor fix RHSA-2025:19736
  • Red Hat Enterprise Linux High Availability TUS (v.8.6) pcs 0.10.12-6.el8_6.10, pcs-snmp 0.10.12-6.el8_6.10
    fixed: vendor fix RHSA-2025:19734
  • Red Hat Enterprise Linux High Availability TUS (v.8.8) pcs 0.10.15-4.el8_8.9, pcs-snmp 0.10.15-4.el8_8.9
    fixed: vendor fix RHSA-2025:19647
  • Red Hat Enterprise Linux HighAvailability (v. 8) pcs 0.10.18-2.el8_10.7, pcs-snmp 0.10.18-2.el8_10.7
    fixed: vendor fix RHSA-2025:19719
  • Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4) pcs 0.10.8-1.el8_4.8, pcs-snmp 0.10.8-1.el8_4.8
    fixed: vendor fix RHSA-2025:19948
  • Red Hat Enterprise Linux Resilient Storage (v. 9) pcs 0.11.9-2.el9_6.2, pcs 0.11.10-1.el9_7.1, pcs-snmp 0.11.9-2.el9_6.2, pcs-snmp 0.11.10-1.el9_7.1
    fixed: vendor fix RHSA-2025:19512
  • Red Hat Enterprise Linux Resilient Storage E4S (v.9.2) pcs 0.11.4-7.el9_2.6, pcs-snmp 0.11.4-7.el9_2.6
    fixed: vendor fix RHSA-2025:19733
  • Red Hat Enterprise Linux Resilient Storage EUS (v.9.4) pcs 0.11.7-2.el9_4.5, pcs-snmp 0.11.7-2.el9_4.5
    fixed: vendor fix RHSA-2025:19736
  • Red Hat Enterprise Linux ResilientStorage (v. 8) pcs 0.10.18-2.el8_10.7, pcs-snmp 0.10.18-2.el8_10.7
    fixed: vendor fix RHSA-2025:19719
  • Red Hat Enterprise Linux ResilientStorage E4S (v.9.0) pcs 0.11.1-10.el9_0.9, pcs-snmp 0.11.1-10.el9_0.9
    fixed: vendor fix RHSA-2025:19800
  • Red Hat Satellite 6.15 for RHEL 8 rubygem-rack 2.2.20-1.el8sat
    fixed: vendor fix RHSA-2025:19856
  • Red Hat Satellite 6.16 for RHEL 8 rubygem-rack 2.2.20-1.el8sat Red Hat Satellite 6.16 for RHEL 9 rubygem-rack 2.2.20-1.el9sat
    fixed: vendor fix RHSA-2025:19855
  • Red Hat Satellite 6.17 for RHEL 9 rubygem-rack 2.2.20-1.el9sat
    fixed: vendor fix RHSA-2025:19832
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/vector-rhel9, openshift-logging/fluentd-rhel8, openshift-logging/fluentd-rhel9, openshift-logging/eventrouter-rhel9, openshift-logging/logging-view-plugin-rhel9, openshift-logging/cluster-logging-rhel9-operator, +2 more Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk Red Hat Enterprise Linux 7 pcs, ruby, pcs-snmp, ruby-irb, rubygems, ruby-libs, +9 more
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 ruby, ruby-irb, rubygems, ruby-libs, rubygem-pg, rubygem-irb, +25 more Red Hat Enterprise Linux 9 ruby, rubygems, ruby-libs, rubygem-irb, rubygem-rbs, rubygem-rss, +13 more
    not affected: component not present
  • Red Hat Enterprise Linux 10 ruby Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenStack Platform 13 (Queens) rhosp13/openstack-redis, rhosp13/openstack-haproxy, rhosp13/openstack-mariadb, rhosp13/openstack-rabbitmq, rhosp13/openstack-ovn-northd, rhosp13/openstack-manila-share, +2 more Red Hat Satellite 6.15 for RHEL 8 foreman 3.9.1.13-1.el8sat, satellite 6.15.5.6-1.el8sat, foreman-cli 3.9.1.13-1.el8sat, foreman-ec2 3.9.1.13-1.el8sat, foreman-pcp 3.9.1.13-1.el8sat, foreman-ovirt 3.9.1.13-1.el8sat, +12 more Red Hat Satellite 6.16 for RHEL 8 foreman 3.12.0.11-1.el8sat, satellite 6.16.5.5-1.el8sat, foreman-cli 3.12.0.11-1.el8sat, foreman-ec2 3.12.0.11-1.el8sat, foreman-pcp 3.12.0.11-1.el8sat, satellite-cli 6.16.5.5-1.el8sat, +12 more Red Hat Satellite 6.16 for RHEL 9 foreman 3.12.0.11-1.el9sat, satellite 6.16.5.5-1.el9sat, foreman-cli 3.12.0.11-1.el9sat, foreman-ec2 3.12.0.11-1.el9sat, foreman-pcp 3.12.0.11-1.el9sat, satellite-cli 6.16.5.5-1.el9sat, +12 more
    +1 more products
    Red Hat Satellite 6.17 for RHEL 9 candlepin 4.4.23-1.el9sat, satellite 6.17.6-1.el9sat, foreman 3.14.0.10-1.el9sat, satellite-cli 6.17.6-1.el9sat, foreman-cli 3.14.0.10-1.el9sat, foreman-ec2 3.14.0.10-1.el9sat, +20 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
rubygems rack
<2.2.18
2.2.18

Affected products

  • rack rack

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.