High
twisted — security advisory
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service it hosts. This issue is fixed in version 26.10.0rc1.
- Products
- twisted
- Affected versions
- 22.4.0-4, 22.4.0-4+deb12u1, 23.10.0-1, 23.10.0-2, 24.10.0-1, 24.10.0-2, 24.11.0-1, 24.3.0-1, 24.3.0-2, 24.3.0-3, 24.7.0-1, 24.7.0-2, 24.7.0-3, 25.5.0-1, 25.5.0-2, 25.5.0-3, 25.5.0-4, 25.5.0-5, 26.4.0-1, 26.4.0-2, 26.4.0-3, 26.4.0-4, 26.4.0-5, 26.4.0-6
- Fixed versions
- Not specified
- CVEs
- CVE-2026-115778
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:43 UTC · Revision 1
Source evidence
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service it hosts. This issue is fixed in version 26.10.0rc1.
osv:DEBIAN-CVE-2026-115778
twisted
Fixed versions: Not specified
twisted
Fixed versions: Not specified
twisted
Fixed versions: Not specified
Complete source record
{
"id": "a7b37c5807f0e5732ba14de3a5332a4c1435086835eaccaaa938e9c0f2a635cd",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-115778",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-115778",
"summary": "Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service it hosts. This issue is fixed in version 26.10.0rc1.",
"evidence": "osv:DEBIAN-CVE-2026-115778",
"products": [
{
"name": {
"value": "twisted",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "22.4.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "22.4.0-4+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "23.10.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "23.10.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "24.10.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "24.10.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "24.11.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "24.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "24.3.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "24.3.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "24.7.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "24.7.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "24.7.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "25.5.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "25.5.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "25.5.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "25.5.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "25.5.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "26.4.0-6",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "twisted",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "24.11.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "25.5.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "25.5.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "25.5.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "25.5.0-4",
"evidence": "/affected/1/versions"
},
{
"value": "25.5.0-5",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-4",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-5",
"evidence": "/affected/1/versions"
},
{
"value": "26.4.0-6",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "twisted",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "24.11.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "25.5.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "25.5.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "25.5.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "25.5.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "25.5.0-5",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-5",
"evidence": "/affected/2/versions"
},
{
"value": "26.4.0-6",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-115778",
"aliases": [
"DEBIAN-CVE-2026-115778"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "twisted",
"purl": "pkg:deb/debian/twisted?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"22.4.0-4",
"22.4.0-4+deb12u1",
"23.10.0-1",
"23.10.0-2",
"24.10.0-1",
"24.10.0-2",
"24.11.0-1",
"24.3.0-1",
"24.3.0-2",
"24.3.0-3",
"24.7.0-1",
"24.7.0-2",
"24.7.0-3",
"25.5.0-1",
"25.5.0-2",
"25.5.0-3",
"25.5.0-4",
"25.5.0-5",
"26.4.0-1",
"26.4.0-2",
"26.4.0-3",
"26.4.0-4",
"26.4.0-5",
"26.4.0-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115778.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "twisted",
"purl": "pkg:deb/debian/twisted?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"24.11.0-1",
"25.5.0-1",
"25.5.0-2",
"25.5.0-3",
"25.5.0-4",
"25.5.0-5",
"26.4.0-1",
"26.4.0-2",
"26.4.0-3",
"26.4.0-4",
"26.4.0-5",
"26.4.0-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115778.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "twisted",
"purl": "pkg:deb/debian/twisted?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"24.11.0-1",
"25.5.0-1",
"25.5.0-2",
"25.5.0-3",
"25.5.0-4",
"25.5.0-5",
"26.4.0-1",
"26.4.0-2",
"26.4.0-3",
"26.4.0-4",
"26.4.0-5",
"26.4.0-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115778.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:31.238619400Z",
"provider": "osv",
"upstream": [
"CVE-2026-115778"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-115778"
]
},
"related_cves": [
{
"value": "CVE-2026-115778",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461040,
"published_at": "2026-10-23T21:17:23.32+00:00"
}