Bug 2496476 (CVE-2026-11946) - CVE-2026-11946 open62541: open62541: Denial of Service via unvalidated endpoint URL length
Summary: CVE-2026-11946 open62541: open62541: Denial of Service via unvalidated endpoi...
Keywords:
Status: NEW
Alias: CVE-2026-11946
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-02 12:01 UTC by OSIDB Bzimport
Modified: 2026-07-02 13:55 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-07-02 12:01:56 UTC 
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.
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