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Vulnerability details: VCID-gtzk-m9rm-57hw
Vulnerability ID VCID-gtzk-m9rm-57hw
Aliases CVE-2024-26146
GHSA-54rr-7fvw-6x8f
Summary Rack Header Parsing leads to Possible Denial of Service Vulnerability # Possible Denial of Service Vulnerability in Rack Header Parsing There is a possible denial of service vulnerability in the header parsing routines in Rack. This vulnerability has been assigned the CVE identifier CVE-2024-26146. Versions Affected: All. Not affected: None Fixed Versions: 2.0.9.4, 2.1.4.4, 2.2.8.1, 3.0.9.1 Impact ------ 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. Releases -------- The fixed releases are available at the normal locations. Workarounds ----------- There are no feasible workarounds for this issue. Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. * 2-0-header-redos.patch - Patch for 2.0 series * 2-1-header-redos.patch - Patch for 2.1 series * 2-2-header-redos.patch - Patch for 2.2 series * 3-0-header-redos.patch - Patch for 3.0 series Credits ------- Thanks to [svalkanov](https://hackerone.com/svalkanov) for reporting this and providing patches!
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1333 Inefficient Regular Expression Complexity
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-26146.json
epss 0.00699 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00699 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00714 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00714 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00714 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00775 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00775 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
epss 0.00775 https://api.first.org/data/v1/epss?cve=CVE-2024-26146
cvssv3.1 5.3 https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
generic_textual LOW https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
ssvc Track https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
cvssv3.1 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr LOW https://github.com/advisories/GHSA-54rr-7fvw-6x8f
generic_textual LOW https://github.com/rack/rack
cvssv3.1 5.3 https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
generic_textual LOW https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
ssvc Track https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
cvssv3.1 5.3 https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
generic_textual LOW https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
ssvc Track https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
cvssv3.1 5.3 https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
generic_textual LOW https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
ssvc Track https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
cvssv3.1 5.3 https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
generic_textual LOW https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
ssvc Track https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
cvssv3.1 5.3 https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
cvssv3.1_qr LOW https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
generic_textual LOW https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
ssvc Track https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
cvssv3.1 5.3 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
generic_textual LOW https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
ssvc Track https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
cvssv3.1 5.3 https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html
ssvc Track https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2024-26146
cvssv3.1 5.3 https://security.netapp.com/advisory/ntap-20240510-0006/
ssvc Track https://security.netapp.com/advisory/ntap-20240510-0006/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-26146.json
https://api.first.org/data/v1/epss?cve=CVE-2024-26146
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-25126
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26141
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26146
https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/rack/rack
https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
https://nvd.nist.gov/vuln/detail/CVE-2024-26146
1064516 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1064516
2265595 https://bugzilla.redhat.com/show_bug.cgi?id=2265595
GHSA-54rr-7fvw-6x8f https://github.com/advisories/GHSA-54rr-7fvw-6x8f
ntap-20240510-0006 https://security.netapp.com/advisory/ntap-20240510-0006/
RHSA-2024:10806 https://access.redhat.com/errata/RHSA-2024:10806
RHSA-2024:1841 https://access.redhat.com/errata/RHSA-2024:1841
RHSA-2024:1846 https://access.redhat.com/errata/RHSA-2024:1846
RHSA-2024:2007 https://access.redhat.com/errata/RHSA-2024:2007
RHSA-2024:2113 https://access.redhat.com/errata/RHSA-2024:2113
RHSA-2024:2581 https://access.redhat.com/errata/RHSA-2024:2581
RHSA-2024:2584 https://access.redhat.com/errata/RHSA-2024:2584
RHSA-2024:2953 https://access.redhat.com/errata/RHSA-2024:2953
RHSA-2024:3431 https://access.redhat.com/errata/RHSA-2024:3431
USN-6689-1 https://usn.ubuntu.com/6689-1/
USN-6837-1 https://usn.ubuntu.com/6837-1/
USN-6837-2 https://usn.ubuntu.com/6837-2/
USN-7036-1 https://usn.ubuntu.com/7036-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-26146.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://discuss.rubyonrails.org/t/possible-denial-of-service-vulnerability-in-rack-header-parsing/84942
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rack/rack/commit/30b8e39a578b25d4bdcc082c1c52c6f164b59716
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rack/rack/commit/6c5d90bdcec0949f7ba06db62fb740dab394b582
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rack/rack/commit/a227cd793778c7c3a827d32808058571569cda6f
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rack/rack/commit/e4c117749ba24a66f8ec5a08eddf68deeb425ccd
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

low

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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local

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-26146.yml
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://security.netapp.com/advisory/ntap-20240510-0006/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-02-29T17:31:54Z/ Found at https://security.netapp.com/advisory/ntap-20240510-0006/
Exploit Prediction Scoring System (EPSS)
Percentile 0.71937
EPSS Score 0.00699
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:50:21.101903+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/02/GHSA-54rr-7fvw-6x8f/GHSA-54rr-7fvw-6x8f.json 38.0.0