CVE-2026-11946 Affecting open62541 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Jul 2026
- disclosed2 Jul 2026
Introduced: 2 Jul 2026
CVE-2026-11946 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest open62541.
NVD Description
Note: Versions mentioned in the description apply only to the upstream open62541 package and not the open62541 package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) 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 configurations.
The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.