UBUNTU-CVE-2026-33592

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Source

https://ubuntu.com/security/CVE-2026-33592

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33592.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33592

Upstream

CVE-2026-33592

Published

2026-07-03T00:00:00Z

Modified

2026-07-03T21:45:13.566539944Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:25.10 / open62541

Package

Name: open62541
Purl: pkg:deb/ubuntu/open62541?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.6-1

1.4.11.1-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libopen62541-1.4",
            "binary_version": "1.4.11.1-1"
        },
        {
            "binary_name": "libopen62541-1.4-tools",
            "binary_version": "1.4.11.1-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33592.json"

Ubuntu:26.04:LTS / open62541