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CVE-2024-26146

Possible Denial of Service Vulnerability in Rack Header Parsing

HIGH
7.5
CVSS Score
Published: February 28, 2024 at 11:28 PM UTC
Updated: June 17, 2026 at 07:17 AM UTC
3 products affected across 3 vendorsDebian LinuxRackRack

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.0
Rack· Rack Project
95%
v < 2.0.9.42.1.0 ≤ v < 2.1.4.42.2.0 ≤ v < 2.2.8.13.0.0 ≤ v < 3.0.9.12.1.02.2.03.0.0
Affected range stops below 2.0.9.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.0.9.1, so it looks safe — our inference, not a vendor statement
Rack· Rackrubygems
95%
v < 2.0.9.4v < 2.1.4.4v < 2.2.8.1v < 3.0.9.10.4 ≤ v < 2.0.9.42.1.0 ≤ v < 2.1.4.42.2.0 ≤ v < 2.2.8.1
Affected range stops below 2.0.9.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.0.9.1, so it looks safe — our inference, not a vendor statement

References (9)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
x_refsource_MISCPatch
Source: [email protected]
https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
x_refsource_MISCPatch
Source: [email protected]
https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
x_refsource_MISCPatch
Source: [email protected]
https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
x_refsource_MISCPatch
Source: [email protected]
https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
Mailing List
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1333

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