ruby-rack — security advisory
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).
- 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, 3.1.16-0.1, 3.1.18-1~deb13u1
- Fixed versions
- 2.2.20-0+deb12u1, 3.1.18-1, 3.1.18-1~deb13u1
- CVEs
- CVE-2025-61919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:45 UTC · Revision 1
Source evidence
Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).
osv:DEBIAN-CVE-2025-61919
ruby-rack
Fixed versions: 2.2.20-0+deb12u1
ruby-rack
Fixed versions: 3.1.18-1~deb13u1
ruby-rack
Fixed versions: 3.1.18-1
Complete source record
{
"id": "5e55b02a1fa9d943e1d64646b2b6a1338259b4df4d8f981a81d2dce07a1742bc",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-61919",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-61919",
"summary": "Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a length or cap. Large request bodies can therefore be buffered completely into process memory before parsing, leading to denial of service (DoS) through memory exhaustion. Users should upgrade to Rack version 2.2.20, 3.1.18, or 3.2.3, anu of which enforces form parameter limits using `query_parser.bytesize_limit`, preventing unbounded reads of `application/x-www-form-urlencoded` bodies. Additionally, enforce strict maximum body size at the proxy or web server layer (e.g., Nginx `client_max_body_size`, Apache `LimitRequestBody`).",
"evidence": "osv:DEBIAN-CVE-2025-61919",
"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": [
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"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"
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]
},
{
"name": {
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],
"affected_versions": [
{
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"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.1.18-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.1.16-0.1",
"evidence": "/affected/2/versions"
},
{
"value": "3.1.18-1~deb13u1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2025-61919",
"aliases": [
"DEBIAN-CVE-2025-61919"
],
"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-2025-61919.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.1.18-1~deb13u1"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.1.16-0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61919.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "3.1.18-1"
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],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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"3.1.18-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61919.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:29.104125776Z",
"provider": "osv",
"upstream": [
"CVE-2025-61919"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-61919"
]
},
"related_cves": [
{
"value": "CVE-2025-61919",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 417186,
"published_at": "2025-10-10T20:15:37.73+00:00"
}