ruby-rack — security advisory
Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.
- Products
- ruby-rack
- Affected versions
- 2.2.13-1~deb12u1, 2.2.6.4-1, 2.2.6.4-1+deb12u1, 2.2.7-1, 2.2.7-1.1
- Fixed versions
- 2.2.20-0+deb12u1, 3.0.8-2
- CVEs
- CVE-2025-59830
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:24 UTC · Revision 1
Source evidence
Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.
osv:DEBIAN-CVE-2025-59830
ruby-rack
Fixed versions: 2.2.20-0+deb12u1
ruby-rack
Fixed versions: 3.0.8-2
ruby-rack
Fixed versions: 3.0.8-2
Complete source record
{
"id": "0da84d306521f453cea21a6cdb53d7d20b7326aee0a715946d7eee7bb32d6405",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-59830",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-59830",
"summary": "Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.",
"evidence": "osv:DEBIAN-CVE-2025-59830",
"products": [
{
"name": {
"value": "ruby-rack",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.2.20-0+deb12u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2.2.13-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.6.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.6.4-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.2.7-1.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "ruby-rack",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.8-2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-rack",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.8-2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2025-59830",
"aliases": [
"DEBIAN-CVE-2025-59830"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.20-0+deb12u1"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.2.13-1~deb12u1",
"2.2.6.4-1",
"2.2.6.4-1+deb12u1",
"2.2.7-1",
"2.2.7-1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-59830.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.8-2"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-59830.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.8-2"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-59830.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:42.782770284Z",
"provider": "osv",
"upstream": [
"CVE-2025-59830"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-59830"
]
},
"related_cves": [
{
"value": "CVE-2025-59830",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 418502,
"published_at": "2025-09-25T15:16:13.78+00:00"
}