# Open62541 Project Open62541 vulnerabilities

Source: https://junglewise.ai/threats/technologies/open62541  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/open62541.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 18 vulnerabilities in Open62541 Project Open62541: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-82623, was published on 31 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 18 (0 critical, 0 exploited in the wild)

## About Open62541 Project Open62541

An open source implementation of OPC UA (OPC Unified Architecture) written in C.

## Latest Open62541 Project Open62541 vulnerabilities

- [CVE-2026-82623: open62541 use-after-free in history backend](https://junglewise.ai/threats/cve-2026-82623-open62541-use-after-free-in-history-backend) (medium, CVSS 5.3, published 31 Aug 2026)
- [CVE-2026-67862: open62541 heap-buffer-overflow in high-level attribute reading](https://junglewise.ai/threats/cve-2026-67862-open62541-heap-buffer-overflow-in-high-level-attribute-reading) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67861: open62541 stack overflow in UA_Client_getRemoteDataTypes](https://junglewise.ai/threats/cve-2026-67861-open62541-stack-overflow-in-ua-client-getremotedatatypes) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67860: open62541 heap buffer overflow in HistoryRead continuation point handling](https://junglewise.ai/threats/cve-2026-67860-open62541-heap-buffer-overflow-in-historyread-continuation-point) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67859: open62541 buffer overflow in Discovery/LDS handling](https://junglewise.ai/threats/cve-2026-67859-open62541-buffer-overflow-in-discovery-lds-handling) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67858: open62541 buffer overflow in Local Discovery Server multicast discovery](https://junglewise.ai/threats/cve-2026-67858-open62541-buffer-overflow-in-local-discovery-server-multicast) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67857: open62541 out-of-bounds read in responseReadNamespacesArray](https://junglewise.ai/threats/cve-2026-67857-open62541-out-of-bounds-read-in-responsereadnamespacesarray) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67856: open62541 denial of service via subscription requests](https://junglewise.ai/threats/cve-2026-67856-open62541-denial-of-service-via-subscription-requests) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67855: open62541 heap use-after-free in GDS PushManagement certificate update](https://junglewise.ai/threats/cve-2026-67855-open62541-heap-use-after-free-in-gds-pushmanagement-certificate) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-18785: open62541 client stack overflow in UA_Client_getRemoteDataTypes](https://junglewise.ai/threats/cve-2026-18785-open62541-client-stack-overflow-in-ua-client-getremotedatatypes) (medium, CVSS 5.3, published 4 Aug 2026)
- [CVE-2026-18784: open62541 heap buffer overflow in UA_Client_readNodeClassAttribute](https://junglewise.ai/threats/cve-2026-18784-open62541-heap-buffer-overflow-in-ua-client) (medium, CVSS 5.3, published 4 Aug 2026)
- [CVE-2026-65423: o6 Automation open62541 integer overflow in UA_Variant arrayDimensions](https://junglewise.ai/threats/cve-2026-65423-o6-automation-open62541-integer-overflow-in-ua-variant) (high, CVSS 8.8, published 30 Jul 2026)
- [CVE-2026-63362: o6 Automation open62541 integer underflow in PubSub signature verification](https://junglewise.ai/threats/cve-2026-63362-o6-automation-open62541-integer-underflow-in-pubsub-signature) (medium, CVSS 5.9, published 30 Jul 2026)
- [CVE-2026-63035: o6 Automation open62541 use-after-free in TransferSubscriptions service](https://junglewise.ai/threats/cve-2026-63035-o6-automation-open62541-use-after-free-in-transfersubscriptions) (high, CVSS 8.1, published 30 Jul 2026)
- [CVE-2026-63559: o6 Automation open62541 integer overflow in UA_Variant arrayDimensions](https://junglewise.ai/threats/cve-2026-63559-o6-automation-open62541-integer-overflow-in-ua-variant) (high, CVSS 7.5, published 30 Jul 2026)
- [CVE-2026-15690: open62541 null pointer dereference in responseReadNamespacesArray](https://junglewise.ai/threats/cve-2026-15690-open62541-null-pointer-dereference-in-responsereadnamespacesarray) (low, CVSS 3.1, published 14 Jul 2026)
- [CVE-2026-11946: open62541 memory exhaustion in GetEndpoints Discovery Service](https://junglewise.ai/threats/cve-2026-11946-open62541-memory-exhaustion-in-getendpoints-discovery-service) (high, CVSS 7.5, published 2 Jul 2026)
- [CVE-2026-33592: open62541 memory exhaustion in FindServers Discovery Service](https://junglewise.ai/threats/cve-2026-33592-open62541-memory-exhaustion-in-findservers-discovery-service) (high, CVSS 7.5, published 2 Jul 2026)

## Most severe Open62541 Project Open62541 vulnerabilities

- [CVE-2026-65423: o6 Automation open62541 integer overflow in UA_Variant arrayDimensions](https://junglewise.ai/threats/cve-2026-65423-o6-automation-open62541-integer-overflow-in-ua-variant) (high, CVSS 8.8, published 30 Jul 2026)
- [CVE-2026-63035: o6 Automation open62541 use-after-free in TransferSubscriptions service](https://junglewise.ai/threats/cve-2026-63035-o6-automation-open62541-use-after-free-in-transfersubscriptions) (high, CVSS 8.1, published 30 Jul 2026)
- [CVE-2026-67858: open62541 buffer overflow in Local Discovery Server multicast discovery](https://junglewise.ai/threats/cve-2026-67858-open62541-buffer-overflow-in-local-discovery-server-multicast) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67859: open62541 buffer overflow in Discovery/LDS handling](https://junglewise.ai/threats/cve-2026-67859-open62541-buffer-overflow-in-discovery-lds-handling) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67856: open62541 denial of service via subscription requests](https://junglewise.ai/threats/cve-2026-67856-open62541-denial-of-service-via-subscription-requests) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67861: open62541 stack overflow in UA_Client_getRemoteDataTypes](https://junglewise.ai/threats/cve-2026-67861-open62541-stack-overflow-in-ua-client-getremotedatatypes) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67857: open62541 out-of-bounds read in responseReadNamespacesArray](https://junglewise.ai/threats/cve-2026-67857-open62541-out-of-bounds-read-in-responsereadnamespacesarray) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67862: open62541 heap-buffer-overflow in high-level attribute reading](https://junglewise.ai/threats/cve-2026-67862-open62541-heap-buffer-overflow-in-high-level-attribute-reading) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67855: open62541 heap use-after-free in GDS PushManagement certificate update](https://junglewise.ai/threats/cve-2026-67855-open62541-heap-use-after-free-in-gds-pushmanagement-certificate) (high, CVSS 7.5, published 4 Aug 2026)
- [CVE-2026-67860: open62541 heap buffer overflow in HistoryRead continuation point handling](https://junglewise.ai/threats/cve-2026-67860-open62541-heap-buffer-overflow-in-historyread-continuation-point) (high, CVSS 7.5, published 4 Aug 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 1 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Open62541 Project Open62541 vulnerabilities", https://junglewise.ai/threats/technologies/open62541, 9 November 2026.