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Fencer Intel
high 7.5

CVE-2025-61919 json

Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing

published last yr. modified 21d ago also EUVD-2025-33748 , GHSA-6xw4-3v39-52mm

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 51%
public exploits
0
none known

Summary

Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).

Patch / fix

  • rubygems rack 2.2.20, 3.1.18, 3.2.3
  • rack rack 2.2.20, 3.1.18, 3.2.3
  • rack_project rack 2.2.20, 3.1.18, 3.2.3
  • ruby-rack Debian 12 2.2.20-0+deb12u1
  • ruby-rack Debian 13 3.1.18-1~deb13u1
  • ruby-rack Debian 14 3.1.18-1

debian advisories DEBIAN-CVE-2025-61919

  • ruby-rack Ubuntu 22.04 LTS 2.1.4-5ubuntu1.2
  • ruby-rack Ubuntu 24.04 LTS 2.2.7-1ubuntu0.5
  • ruby-rack Ubuntu 25.10 3.1.16-0.1ubuntu0.1
  • ruby-rack Ubuntu Pro 20.04 LTS 2.0.7-2ubuntu0.1+esm8

ubuntu advisories UBUNTU-CVE-2025-61919

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 7 0.9.169-3.el7_9.5
  • pcs-snmp RHEL 7 0.9.169-3.el7_9.5
  • 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

red hat advisories RHSA-2025:21696RHSA-2025:21036RHSA-2025:20962RHSA-2025:19948RHSA-2025:19856RHSA-2025:19855

  • hawk2 SLE High Availability Extension 16.0, SLES for SAP applications 16.0 2.7.0+git.1742310530.bfcd0e2c-160000.3.1
  • rubygem-rack SLE High Availability Extension 15 SP7, SLE High Availability Extension 15 SP6, SLE High Availability Extension 15 SP5 +3 more 2.2.20-150000.3.34.1

suse advisories SUSE-SU-2026:20091-1SUSE-SU-2026:20093-1SUSE-SU-2025:4273-1

  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.22-1.1
  • hawk2 openSUSE Leap 16.0 2.7.0+git.1742310530.bfcd0e2c-160000.3.1
  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.20-1.1

opensuse advisories openSUSE-SU-2026:10286-1openSUSE-SU-2026:20025-1openSUSE-SU-2025:15642-1

  • 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

Is CVE-2025-61919 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2025-61919 updated cvss 7.5

rubygem-rack: Unbounded read in `Rack::Request` form parsing can lead to memory exhaustion

  • 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.”
  • Red Hat Satellite 6 rubygem-rack
    affected: workaround, no fix available “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.”
  • 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” RHSA-2025:19800
show 18 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” RHSA-2025:19800
  • Red Hat Enterprise Linux Server HighAvailability (v. 7 ELS) pcs 0.9.169-3.el7_9.5, pcs-snmp 0.9.169-3.el7_9.5 Red Hat Enterprise Linux Server ResilientStorage (v. 7 ELS) pcs 0.9.169-3.el7_9.5, pcs-snmp 0.9.169-3.el7_9.5
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” RHSA-2025:21696
  • Red Hat Satellite 6.15 for RHEL 8 rubygem-rack 2.2.20-1.el8sat
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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 “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” RHSA-2025:19855
  • Red Hat Satellite 6.17 for RHEL 9 rubygem-rack 2.2.20-1.el9sat
    fixed: vendor fix “No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability beyond these configuration-based workarounds.” 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
    not affected: vulnerable code not present
  • 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
    not affected: component not present
  • Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk Red Hat Enterprise Linux 7 ruby, ruby-irb, rubygems, ruby-libs, ruby-tcltk, rubygem-json, +6 more 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 Red Hat Enterprise Linux 10 ruby Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +5 more products
    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 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
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
<2.2.20
>=3.0, <3.1.18
>=3.2, <3.2.3
2.2.20
3.1.18
3.2.3

Affected products

  • rack rack

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel 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.