DEBIAN-CVE-2026-82397
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.
DEBIAN-CVE-2026-82397
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-2026-82397
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-2026-82397.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-2026-82397.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-2026-82397.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58488 · Revision 1
- Added to Heist Feed
- Publisher date