High
rails — security advisory
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.
- Products
- rails
- Affected versions
- 2:4.1.10-1, 2:4.2.10-0ubuntu4, 2:4.2.10-0ubuntu4+esm1, 2:4.2.10-0ubuntu4+esm2, 2:4.2.5-1, 2:4.2.5.1-1, 2:4.2.5.2-2, 2:4.2.6-1, 2:4.2.6-1ubuntu0.1~esm1, 2:4.2.6-1ubuntu0.1~esm2, 2:4.2.9-2, 2:4.2.9-4, 2:5.2.2.1+dfsg-1ubuntu1, 2:5.2.3+dfsg-3, 2:5.2.3+dfsg-3ubuntu0.1~esm1, 2:6.0.3.7+dfsg-2, 2:6.1.4.1+dfsg-8ubuntu2, 2:6.1.4.1+dfsg-8ubuntu2+esm1, 2:6.1.7.3+dfsg-2build1, 2:6.1.7.3+dfsg-3, 2:6.1.7.3+dfsg-7, 2:7.2.2.1+dfsg-7, 2:7.2.2.2+dfsg-2, 2:7.2.3+dfsg-2, 2:7.2.3.2+dfsg-2
- Fixed versions
- Not specified
- CVEs
- CVE-2021-22904
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:58 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2021-22904
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
rails
Fixed versions: Not specified
Complete source record
{
"id": "3f738396998a09ffe0d78715d865dd40e33ac1bba3835f278194df40e6571538",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-22904",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2021-22904",
"summary": "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.",
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{
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},
{
"binary_name": "ruby-activesupport",
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},
{
"binary_name": "ruby-rails",
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},
{
"binary_name": "ruby-railties",
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]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rails",
"purl": "pkg:deb/ubuntu/rails?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"2:7.2.2.2+dfsg-2",
"2:7.2.3+dfsg-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-22904.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "ruby-actioncable",
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},
{
"binary_name": "ruby-actionmailbox",
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},
{
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{
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},
{
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},
{
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},
{
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},
{
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},
{
"binary_name": "ruby-activerecord",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activestorage",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-activesupport",
"binary_version": "2:7.2.3+dfsg-2"
},
{
"binary_name": "ruby-rails",
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},
{
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}
]
}
}
],
"modified": "2026-10-17T12:56:19.367358148Z",
"provider": "osv",
"upstream": [
"CVE-2021-22904"
],
"references": [
"https://ubuntu.com/security/CVE-2021-22904",
"https://github.com/rails/rails/commit/eab8c20f3ef6a022c4c11b439b1b22cef1768d5e",
"https://github.com/rails/rails/commit/d861fa8ade353390c4419b53a6c6b41f3005b1f2",
"https://github.com/rails/rails/commit/3d9e9fdf14e044b3ba66f909582c228a9d4ffb5c",
"https://www.cve.org/CVERecord?id=CVE-2021-22904"
]
},
"related_cves": [
{
"value": "CVE-2021-22904",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355259,
"published_at": "2021-06-11T16:15:00+00:00"
}