High
passenger — security advisory
The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.
- Products
- passenger
- Affected versions
- 6.0.24+ds-3, 6.0.26+ds-1.1, 6.1.1+ds-1, 6.1.1+ds-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-26803
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:25 UTC · Revision 1
Source evidence
The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.
osv:UBUNTU-CVE-2025-26803
passenger
Fixed versions: Not specified
passenger
Fixed versions: Not specified
passenger
Fixed versions: Not specified
Complete source record
{
"id": "d8c122a0b7bf993f860bc911ca9bce1cb490d10d186d62be55781054e435ab39",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-26803",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-26803",
"summary": "The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.",
"evidence": "osv:UBUNTU-CVE-2025-26803",
"products": [
{
"name": {
"value": "passenger",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.24+ds-3",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.26+ds-1.1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "passenger",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.1.1+ds-1",
"evidence": "/affected/1/versions"
},
{
"value": "6.1.1+ds-1build1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "passenger",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.26+ds-1.1",
"evidence": "/affected/2/versions"
},
{
"value": "6.1.1+ds-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2025-26803",
"aliases": [
"UBUNTU-CVE-2025-26803"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "passenger",
"purl": "pkg:deb/ubuntu/passenger?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"6.0.24+ds-3",
"6.0.26+ds-1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26803.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libapache2-mod-passenger",
"binary_version": "6.0.26+ds-1.1"
},
{
"binary_name": "passenger",
"binary_version": "6.0.26+ds-1.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "passenger",
"purl": "pkg:deb/ubuntu/passenger?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"6.1.1+ds-1",
"6.1.1+ds-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26803.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libapache2-mod-passenger",
"binary_version": "6.1.1+ds-1build1"
},
{
"binary_name": "passenger",
"binary_version": "6.1.1+ds-1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "passenger",
"purl": "pkg:deb/ubuntu/passenger?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"6.0.26+ds-1.1",
"6.1.1+ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26803.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libapache2-mod-passenger",
"binary_version": "6.1.1+ds-1"
},
{
"binary_name": "passenger",
"binary_version": "6.1.1+ds-1"
}
]
}
}
],
"modified": "2026-10-17T12:56:48.989337928Z",
"provider": "osv",
"upstream": [
"CVE-2025-26803"
],
"references": [
"https://ubuntu.com/security/CVE-2025-26803",
"https://www.cve.org/CVERecord?id=CVE-2025-26803",
"https://blog.phusion.nl/2025/02/19/passenger-6-0-26/",
"https://github.com/phusion/passenger/commit/bb15591646687064ab2d578d5f9660b2a4168017",
"https://github.com/phusion/passenger/compare/release-6.0.25...release-6.0.26",
"https://github.com/phusion/passenger/releases/tag/release-6.0.26",
"https://www.phusionpassenger.com/support"
]
},
"related_cves": [
{
"value": "CVE-2025-26803",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 356366,
"published_at": "2025-02-24T16:15:00+00:00"
}