CVE-2026-67858: n/a
A buffer overflow vulnerability exists in open62541 version 1.5.5 when the Local Discovery Server (LDS) is configured with multicast discovery enabled via the MDNSD backend. An unauthenticated remote attacker can exploit this by sending a RegisterServer or RegisterServer2 request with many unique discoveryUrls, causing a denial of service. The vulnerability has a CVSS 3.1 score of 7.5, indicating high severity. No patch or official remediation guidance is currently available.
AI Analysis
Technical Summary
CVE-2026-67858 describes a buffer overflow in open62541 1.5.5's Local Discovery Server component when multicast discovery is enabled through the MDNSD backend. The flaw allows an unauthenticated remote attacker to send crafted RegisterServer or RegisterServer2 requests containing numerous unique discoveryUrls, triggering a denial of service condition by overflowing internal buffers. The vulnerability is rated high severity with a CVSS 3.1 score of 7.5 and does not require user interaction for exploitation. No vendor advisory or patch information is provided at this time.
Potential Impact
Successful exploitation results in denial of service, disrupting the availability of the Local Discovery Server in open62541 1.5.5 when multicast discovery via MDNSD is enabled. There is no indication of confidentiality or integrity impact. The attacker does not require authentication or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling multicast discovery via the MDNSD backend in the Local Discovery Server configuration to mitigate exposure.
CVE-2026-67858: n/a
Description
A buffer overflow vulnerability exists in open62541 version 1.5.5 when the Local Discovery Server (LDS) is configured with multicast discovery enabled via the MDNSD backend. An unauthenticated remote attacker can exploit this by sending a RegisterServer or RegisterServer2 request with many unique discoveryUrls, causing a denial of service. The vulnerability has a CVSS 3.1 score of 7.5, indicating high severity. No patch or official remediation guidance is currently available.
CVSS v3.1
Score 7.5high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67858 describes a buffer overflow in open62541 1.5.5's Local Discovery Server component when multicast discovery is enabled through the MDNSD backend. The flaw allows an unauthenticated remote attacker to send crafted RegisterServer or RegisterServer2 requests containing numerous unique discoveryUrls, triggering a denial of service condition by overflowing internal buffers. The vulnerability is rated high severity with a CVSS 3.1 score of 7.5 and does not require user interaction for exploitation. No vendor advisory or patch information is provided at this time.
Potential Impact
Successful exploitation results in denial of service, disrupting the availability of the Local Discovery Server in open62541 1.5.5 when multicast discovery via MDNSD is enabled. There is no indication of confidentiality or integrity impact. The attacker does not require authentication or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling multicast discovery via the MDNSD backend in the Local Discovery Server configuration to mitigate exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-30T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a725cbabf8831d5398274e2
Added to database: 08/04/2026, 21:42:18 UTC
Last enriched: 08/04/2026, 21:56:26 UTC
Last updated: 08/04/2026, 23:52:57 UTC
Views: 4
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