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Fencer Vulns
medium 5.3

CVE-2024-26146 json

Possible Denial of Service Vulnerability in Rack Header Parsing

published 2024-02-28 2 y ago modified 2026-09-10 1 mo ago also EUVD-2024-0516 , GHSA-54rr-7fvw-6x8f

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

Rack is a modular Ruby web server interface. Carefully crafted headers can cause header parsing in Rack to take longer than expected resulting in a possible denial of service issue. Accept and Forwarded headers are impacted. Ruby 3.2 has mitigations for this problem, so Rack applications using Ruby 3.2 or newer are unaffected. This vulnerability is fixed in 2.0.9.4, 2.1.4.4, 2.2.8.1, and 3.0.9.1.

Patch / fix

  • rubygems rack 2.0.9.4, 2.1.4.4, 2.2.8.1, 3.0.9.1
  • rack_project rack 2.0.9.4, 2.1.4.4, 2.2.8.1, 3.0.9.1
  • ruby-rack Debian 12 2.2.6.4-1+deb12u1
  • ruby-rack Debian 14, Debian 13 2.2.7-1.1

debian advisories DEBIAN-CVE-2024-26146

  • ruby-rack Ubuntu 22.04 LTS 2.1.4-5ubuntu1.1
  • ruby-rack Ubuntu 24.04 LTS 2.2.7-1ubuntu0.1
  • ruby-rack Ubuntu Pro 14.04 LTS 1.5.2-3+deb8u3ubuntu1~esm8
  • ruby-rack Ubuntu Pro 16.04 LTS 1.6.4-3ubuntu0.2+esm6
  • ruby-rack Ubuntu Pro 18.04 LTS 1.6.4-4ubuntu0.2+esm6
  • ruby-rack Ubuntu Pro 20.04 LTS 2.0.7-2ubuntu0.1+esm5
  • ruby-rack Ubuntu Pro 22.04 LTS 2.1.4-5ubuntu1+esm5

ubuntu advisories UBUNTU-CVE-2024-26146

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

  • rubygem-rack satellite capsule 6.15, satellite 6.15 2.2.8.1-1.el8sat
  • python-pulp-container satellite capsule 6.15, satellite 6.15 2.16.9-2.el8pc
  • rubygem-activestorage satellite 6.15 6.1.7.7-1.el8sat
  • python3.11-pulp-container satellite capsule 6.15, satellite 6.15 2.16.9-2.el8pc
  • pcs RHEL 9 0.11.7-2.el9_4
  • pcs-snmp RHEL 9 0.11.7-2.el9_4
  • pcs RHEL 8 0.10.18-2.el8_10
  • pcs-snmp RHEL 8 0.10.18-2.el8_10

red hat advisories RHSA-2024:10806RHSA-2024:3431RHSA-2024:2113RHSA-2024:2953RHSA-2024:2007RHSA-2024:1846

  • rubygem-rack OpenStack Cloud Crowbar 9, OpenStack Cloud Crowbar 8 1.6.13-3.22.1
  • rubygem-rack-1_4 SLE Module for Containers 12 1.4.5-9.3.1
  • rubygem-rack SLE High Availability Extension 15 SP5, SLE High Availability Extension 15 SP4, SLE High Availability Extension 15 SP3 +2 more 2.0.8-150000.3.21.2

suse advisories SUSE-SU-2024:1131-1SUSE-SU-2024:0946-1SUSE-SU-2024:0765-1

  • rubygem-rack openSUSE Tumbleweed 3.1.18-1.3
  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.22-1.1
  • rubygem-rack openSUSE Tumbleweed 3.1.12-1.1
  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.11-1.1
  • rubygem-rack openSUSE Tumbleweed 3.0.9.1-1.1
  • rubygem-rack-2.2 openSUSE Tumbleweed 2.2.8.1-1.1

opensuse advisories openSUSE-SU-2026:10358-1openSUSE-SU-2026:10286-1openSUSE-SU-2025:14875-1openSUSE-SU-2025:14811-1openSUSE-SU-2024:13726-1openSUSE-SU-2024:13727-1

  • pcs AlmaLinux 8 0.10.18-2.el8_10
  • pcs-snmp AlmaLinux 8 0.10.18-2.el8_10
  • pcs AlmaLinux 9 0.11.7-2.el9_4
  • pcs-snmp AlmaLinux 9 0.11.7-2.el9_4

almalinux advisories ALSA-2024:2953ALSA-2024:2113

  • pcs Rocky Linux 8 0.10.18-2.el8_10

rocky linux advisories RLSA-2024:2953

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-2024-26146 updated cvss 5.3

rubygem-rack: Possible Denial of Service Vulnerability in Rack Header Parsing

  • Red Hat 3scale API Management Platform 2 3scale-amp2/zync-rhel8, 3scale-amp2/system-rhel7, 3scale-amp2/backend-rhel8
    affected: workaround, no fix available, no fix planned “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.”
  • Red Hat Enterprise Linux 7 pcs, pcs-snmp, python-clufter
    affected: workaround, no fix planned “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.”
  • Red Hat Enterprise Linux High Availability AUS (v.8.4) pcs 0.10.8-1.el8_4.5, pcs-snmp 0.10.8-1.el8_4.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2584
  • Red Hat Enterprise Linux High Availability E4S (v. 8.2) pcs 0.10.4-6.el8_2.5, pcs-snmp 0.10.4-6.el8_2.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2007
  • Red Hat Enterprise Linux High Availability EUS (v.8.6) pcs 0.10.12-6.el8_6.5, pcs-snmp 0.10.12-6.el8_6.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:3431
  • Red Hat Enterprise Linux High Availability EUS (v.8.8) pcs 0.10.15-4.el8_8.2, pcs-snmp 0.10.15-4.el8_8.2
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2581
  • Red Hat Enterprise Linux High Availability EUS (v.9.0) pcs 0.11.1-10.el9_0.5, pcs-snmp 0.11.1-10.el9_0.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:1841
  • Red Hat Enterprise Linux High Availability EUS (v.9.2) pcs 0.11.4-7.el9_2.1, pcs-snmp 0.11.4-7.el9_2.1
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:1846
show 12 more
  • Red Hat Enterprise Linux High Availability TUS (v. 8.2) pcs 0.10.4-6.el8_2.5, pcs-snmp 0.10.4-6.el8_2.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2007
  • Red Hat Enterprise Linux HighAvailability (v. 8) pcs 0.10.18-2.el8_10, pcs-snmp 0.10.18-2.el8_10
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2953
  • Red Hat Enterprise Linux HighAvailability (v. 9) pcs 0.11.7-2.el9_4, pcs-snmp 0.11.7-2.el9_4
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2113
  • Red Hat Enterprise Linux HighAvailability E4S (v.8.4) pcs 0.10.8-1.el8_4.5, pcs-snmp 0.10.8-1.el8_4.5 Red Hat Enterprise Linux HighAvailability TUS (v.8.4) pcs 0.10.8-1.el8_4.5, pcs-snmp 0.10.8-1.el8_4.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2584
  • Red Hat Enterprise Linux Resilient Storage EUS (v.8.6) pcs 0.10.12-6.el8_6.5, pcs-snmp 0.10.12-6.el8_6.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:3431
  • Red Hat Enterprise Linux Resilient Storage EUS (v.8.8) pcs 0.10.15-4.el8_8.2, pcs-snmp 0.10.15-4.el8_8.2
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2581
  • Red Hat Enterprise Linux Resilient Storage EUS (v.9.0) pcs 0.11.1-10.el9_0.5, pcs-snmp 0.11.1-10.el9_0.5
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:1841
  • Red Hat Enterprise Linux Resilient Storage EUS (v.9.2) pcs 0.11.4-7.el9_2.1, pcs-snmp 0.11.4-7.el9_2.1
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:1846
  • Red Hat Enterprise Linux ResilientStorage (v. 8) pcs 0.10.18-2.el8_10, pcs-snmp 0.10.18-2.el8_10
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2953
  • Red Hat Enterprise Linux ResilientStorage (v. 9) pcs 0.11.7-2.el9_4, pcs-snmp 0.11.7-2.el9_4
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:2113
  • Red Hat Satellite 6.15 for RHEL 8 rubygem-rack 2.2.8.1-1.el8sat
    fixed: vendor fix “No mitigation is currently available for this vulnerability. The recommendation is to perform updates as soon as they are available.” RHSA-2024:10806
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/fluentd-rhel8 Red Hat Satellite 6.15 for RHEL 8 foreman 3.9.1.12-1.el8sat, satellite 6.15.5-1.el8sat, puppetserver 7.17.2-1.el8sat, foreman-cli 3.9.1.12-1.el8sat, foreman-ec2 3.9.1.12-1.el8sat, foreman-pcp 3.9.1.12-1.el8sat, +36 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
2 y ago

Exploit prediction

2.00% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 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
>=3.0.0, <3.0.9.1
>=2.2.0, <2.2.8.1
>=2.1.0, <2.1.4.4
<2.0.9.4
3.0.9.1
2.2.8.1
2.1.4.4
2.0.9.4

Affected products

  • rack rack
  • rack_project rack

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

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.