Medium
python-daphne — security advisory
daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.
- Products
- python-daphne
- Affected versions
- 1.4.2-1, 2.3.0-1, 2.4.0-1, 2.4.1-1, 3.0.1-1, 3.0.2-1, 4.0.0-1, 4.1.2-2, 4.2.1-1, 4.2.1-2, 4.2.2-0.1, 4.2.3-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44546
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:04 UTC · Revision 1
Source evidence
daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.
osv:UBUNTU-CVE-2026-44546
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
python-daphne
Fixed versions: Not specified
Complete source record
{
"id": "603acaad22aadcc4014ace0e689943df45c80cb80f0df9ba500be4f0d51be9f0",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-44546",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-44546",
"summary": "daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \\x0b, \\x0c, \\x1c, \\x1d, \\x1e, or \\x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.",
"evidence": "osv:UBUNTU-CVE-2026-44546",
"products": [
{
"name": {
"value": "python-daphne",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.2-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.3.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.4.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.0.2-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.0-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.1.2-2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.1-2",
"evidence": "/affected/5/versions"
},
{
"value": "4.2.2-0.1",
"evidence": "/affected/5/versions"
},
{
"value": "4.2.3-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "python-daphne",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.1.2-2",
"evidence": "/affected/6/versions"
},
{
"value": "4.2.1-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.2.1-2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-44546",
"aliases": [
"UBUNTU-CVE-2026-44546"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.4.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "1.4.2-1"
},
{
"binary_name": "python3-daphne",
"binary_version": "1.4.2-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.3.0-1",
"2.4.0-1",
"2.4.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "2.4.1-1"
},
{
"binary_name": "python3-daphne",
"binary_version": "2.4.1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"3.0.1-1",
"3.0.2-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "3.0.2-1"
},
{
"binary_name": "python3-daphne",
"binary_version": "3.0.2-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"4.0.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "4.0.0-1"
},
{
"binary_name": "python3-daphne",
"binary_version": "4.0.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"4.1.2-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "4.1.2-2"
},
{
"binary_name": "python3-daphne",
"binary_version": "4.1.2-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"4.2.1-2",
"4.2.2-0.1",
"4.2.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "4.2.3-1"
},
{
"binary_name": "python3-daphne",
"binary_version": "4.2.3-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-daphne",
"purl": "pkg:deb/ubuntu/python-daphne?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"4.1.2-2",
"4.2.1-1",
"4.2.1-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44546.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "daphne",
"binary_version": "4.2.1-2"
},
{
"binary_name": "python3-daphne",
"binary_version": "4.2.1-2"
}
]
}
}
],
"modified": "2026-10-17T13:00:09.131980961Z",
"provider": "osv",
"upstream": [
"CVE-2026-44546"
],
"references": [
"https://ubuntu.com/security/CVE-2026-44546",
"https://www.cve.org/CVERecord?id=CVE-2026-44546"
]
},
"related_cves": [
{
"value": "CVE-2026-44546",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360369,
"published_at": "2026-06-03T14:16:00+00:00"
}