CVE-2026-67857

open62541 1.5.5 contains an out-of-bounds read in the client-side function...

7.5 High

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.63%Up 0.3 points since Aug 5, 2026

What each source reports

CVE List Score used 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: CVE-2026-67857
CVSS 3.1: 7.5 HighCVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
Weakness: CWE-125
Updated: 2026-11-02

EUVDEUVD-2026-52967 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: EUVD-2026-52967
CVSS 3.1: 7.5 HighCVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-2mh5-cmr8-pwvp 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function...

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: GHSA-2mh5-cmr8-pwvp
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

NVD 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: CVE-2026-67857
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-67857 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: DEBIAN-CVE-2026-67857
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-67857 7.5

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Record: UBUNTU-CVE-2026-67857
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`open62541` Debian:13	All versions, plus listed versions 1.4.11.1-11.4.18-1	None known
`open62541` Debian:14	All versions, plus listed versions 1.4.11.1-11.4.18-1	None known
`open62541` Ubuntu:26.10	All versions, plus listed versions 1.4.11.1-1build11.4.18-1	None known
`open62541` Ubuntu:26.04:LTS	All versions, plus listed versions 1.4.11.1-11.4.11.1-1build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-67857 is a high vulnerability (CVSS 7.5) in open62541, published August 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.63%, the 50th percentile. No source names a fixed version.

References

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