CVEvulnerability

CVE-2026-33592

7.5 HIGH Published 2026-07-02 Modified 2026-10-25 Official page ↗

Status: Awaiting Analysis
Published: 2026-07-02
Last modified: 2026-10-25
Assigner: a6d3dc9e-0591-4a13-bce7-0f5b31ff6158
CVSS 3.1 (a6d3dc9e-0591-4a13-bce7-0f5b31ff6158): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses: CWE-770, CWE-789

Description

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.

Weakness · CWE (2)

CWE-770 Allocation of Resources Without Limits or Throttling weakness
CWE-789 Memory Allocation with Excessive Size Value weakness

References

https://github.com/open62541/open62541 github.com
https://github.com/open62541/open62541/pull/8142 github.com
https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae github.com

CVE-2026-33592

Description

Related

Weakness · CWE (2)

References