CVE-2026-11946

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Source
https://cve.org/CVERecord?id=CVE-2026-11946
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11946.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-11946
Downstream
Published
2026-07-02T12:16:54.740Z
Modified
2026-07-15T06:01:16.845261Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / github.com/open62541/open62541

Affected ranges

Type
GIT
Repo
https://github.com/open62541/open62541
Events
Introduced
84347820c8550b5750f2cd581c14ab201611c579
Fixed
f63e2a819aff6e468242dc2e54ccbd5b75d63654
Introduced
b90fbfac5ef484089447bf5e3fe6ad7baaaebada
Fixed
dfd44a234645ed29cc6d190048bc8ae80c5454cd
Database specific 
{
    "source": "DESCRIPTION",
    "extracted_events": [
        {
            "introduced": "1.4.0"
        },
        {
            "fixed": "1.4.16"
        },
        {
            "introduced": "1.5.0"
        },
        {
            "fixed": "1.5.4"
        }
    ]
}

Affected versions

prev-v1.*
prev-v1.4.2
v1.*
v1.4.0
v1.4.1
v1.4.10
v1.4.11
v1.4.11.1
v1.4.12
v1.4.13
v1.4.14
v1.4.15
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.4.6
v1.4.7
v1.4.8
v1.4.9
v1.5.0
v1.5.1
v1.5.2
v1.5.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11946.json"