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Vulnerability record · CVE-2021-22904 · published 11 June 2021

CVE-2021-22904: Rubyonrails rails uncontrolled resource consumption vulnerability

Rubyonrails · Rails

The actionpack ruby gem before 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6 suffers from a possible denial of service vulnerability in the Token Authentication logic in Action Controller due to a too permissive regular expression. Impacted code uses `authenticate_or_request_with_http_token` or `authenticate_with_http_token` for request authentication.

7.5 CVSS 3.1 High EPSS 5.0% · top 8.1% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 5.0
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The actionpack ruby gem before 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6 suffers from a possible denial of service vulnerability in the Token Authentication logic in Action Controller due to a too permissive regular expression. Impacted code uses `authenticate_or_request_with_http_token` or `authenticate_with_http_token` for request authentication.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://discuss.rubyonrails.org/t/cve-2021-22904-possible-dos-vulnerability-in-action-controller-token-authentication/77 ExploitMitigationPatchVendor Advisory
https://hackerone.com/reports/1101125 Permissions RequiredThird Party Advisory
https://security.netapp.com/advisory/ntap-20210805-0009/ Third Party Advisory
https://discuss.rubyonrails.org/t/cve-2021-22904-possible-dos-vulnerability-in-action-controller-token-authentication/77 ExploitMitigationPatchVendor Advisory
https://hackerone.com/reports/1101125 Permissions RequiredThird Party Advisory
https://security.netapp.com/advisory/ntap-20210805-0009/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-22904), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.