DEBIAN-CVE-2026-33592
An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.
DEBIAN-CVE-2026-33592
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-2026-33592
open62541
Source reference: /affected/0/package/name
- Affected versions
- 1.4.11.1-1
Source reference:
/affected/0/versions1.4.18-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
open62541
Source reference: /affected/1/package/name
- Affected versions
- 1.4.11.1-1
Source reference:
/affected/1/versions1.4.18-1Source reference:
/affected/1/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": "open62541",
"purl": "pkg:deb/debian/open62541?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.4.11.1-1",
"1.4.18-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33592.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "open62541",
"purl": "pkg:deb/debian/open62541?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.4.11.1-1",
"1.4.18-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33592.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55932 · Revision 1
- Added to Heist Feed
- Publisher date