DEBIAN-CVE-2026-91990
Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.
DEBIAN-CVE-2026-91990
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-2026-91990
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-2026-91990.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-2026-91990.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-2026-91990.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58577 · Revision 1
- Added to Heist Feed
- Publisher date