DEBIAN-CVE-2026-49854
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6.
DEBIAN-CVE-2026-49854
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-49854
python-tornado
Source reference: /affected/0/package/name
- Affected versions
- 6.2.0-3
Source reference:
/affected/0/versions6.2.0-3+deb12u1Source reference:
/affected/0/versions6.2.0-3+deb12u2Source reference:
/affected/0/versions6.2.0-3+deb12u3Source reference:
/affected/0/versions6.2.0-3+deb12u4Source reference:
/affected/0/versions6.3.2-1Source reference:
/affected/0/versions6.4.0-1Source reference:
/affected/0/versions6.4.0-2Source reference:
/affected/0/versions6.4.1-1Source reference:
/affected/0/versions6.4.1-2Source reference:
/affected/0/versions6.4.1-3Source reference:
/affected/0/versions6.4.2-1Source reference:
/affected/0/versions6.4.2-2Source reference:
/affected/0/versions6.4.2-3Source reference:
/affected/0/versions6.5.2-1Source reference:
/affected/0/versions6.5.2-2Source reference:
/affected/0/versions6.5.2-3Source reference:
/affected/0/versions6.5.4-0.1Source reference:
/affected/0/versions6.5.4-1Source reference:
/affected/0/versions6.5.5-1Source reference:
/affected/0/versions6.5.5-2Source reference:
/affected/0/versions6.5.5-3Source reference:
/affected/0/versions6.5.5-4Source reference:
/affected/0/versions6.5.5-5Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
python-tornado
Source reference: /affected/1/package/name
- Affected versions
- 6.4.2-3
Source reference:
/affected/1/versions6.4.2-3+deb13u1Source reference:
/affected/1/versions6.4.2-3+deb13u2Source reference:
/affected/1/versions6.5.2-1Source reference:
/affected/1/versions6.5.2-2Source reference:
/affected/1/versions6.5.2-3Source reference:
/affected/1/versions6.5.4-0.1Source reference:
/affected/1/versions6.5.4-1Source reference:
/affected/1/versions6.5.5-1Source reference:
/affected/1/versions6.5.5-2Source reference:
/affected/1/versions6.5.5-3Source reference:
/affected/1/versions6.5.5-4Source reference:
/affected/1/versions6.5.5-5Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
python-tornado
Source reference: /affected/2/package/name
- Affected versions
- 6.4.2-3
Source reference:
/affected/2/versions6.5.2-1Source reference:
/affected/2/versions6.5.2-2Source reference:
/affected/2/versions6.5.2-3Source reference:
/affected/2/versions6.5.4-0.1Source reference:
/affected/2/versions6.5.4-1Source reference:
/affected/2/versions6.5.5-1Source reference:
/affected/2/versions6.5.5-2Source reference:
/affected/2/versions6.5.5-3Source reference:
/affected/2/versions6.5.5-4Source reference:
/affected/2/versions6.5.5-5Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-tornado",
"purl": "pkg:deb/debian/python-tornado?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"6.2.0-3",
"6.2.0-3+deb12u1",
"6.2.0-3+deb12u2",
"6.2.0-3+deb12u3",
"6.2.0-3+deb12u4",
"6.3.2-1",
"6.4.0-1",
"6.4.0-2",
"6.4.1-1",
"6.4.1-2",
"6.4.1-3",
"6.4.2-1",
"6.4.2-2",
"6.4.2-3",
"6.5.2-1",
"6.5.2-2",
"6.5.2-3",
"6.5.4-0.1",
"6.5.4-1",
"6.5.5-1",
"6.5.5-2",
"6.5.5-3",
"6.5.5-4",
"6.5.5-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49854.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-tornado",
"purl": "pkg:deb/debian/python-tornado?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"6.4.2-3",
"6.4.2-3+deb13u1",
"6.4.2-3+deb13u2",
"6.5.2-1",
"6.5.2-2",
"6.5.2-3",
"6.5.4-0.1",
"6.5.4-1",
"6.5.5-1",
"6.5.5-2",
"6.5.5-3",
"6.5.5-4",
"6.5.5-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49854.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-tornado",
"purl": "pkg:deb/debian/python-tornado?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"6.4.2-3",
"6.5.2-1",
"6.5.2-2",
"6.5.2-3",
"6.5.4-0.1",
"6.5.4-1",
"6.5.5-1",
"6.5.5-2",
"6.5.5-3",
"6.5.5-4",
"6.5.5-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49854.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57210 · Revision 1
- Added to Heist Feed
- Publisher date