Answer in brief
CVE-2026-33592 records a High severity (CVSS 7.5) vulnerability in FindServers Memory Exhaustion in open62541. The current sources do not mark it as known exploited. The current feed maps open62541 project / o6 Automation GmbH/open62541 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps open62541 project / o6 Automation GmbH/open62541 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| open62541 project / o6 Automation GmbH/open62541generic | 1.4.0 || 1.5.0 || master | Not reported |
Published upstream
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-33592 records a High severity (CVSS 7.5) vulnerability in FindServers Memory Exhaustion in open62541. The current sources do not mark it as known exploited. The current feed maps open62541 project / o6 Automation GmbH/open62541 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps open62541 project / o6 Automation GmbH/open62541 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| open62541 project / o6 Automation GmbH/open62541generic | 1.4.0 || 1.5.0 || master | Not reported |
Published upstream
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
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.
Quoted source text, attributed separately from HOL analysis.