Log in Start free

Vulnerability · Published Jul 14, 2026 · Assigned by VulDB

CVE-2026-15690open62541 Shared Client ua_client_connect.c responseReadNamespacesArray null pointer dereference

Low 3.1

In plain English

A low-severity null pointer dereference in open62541. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.4%top 61.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A vulnerability was identified in open62541 up to 1.5.5. Affected by this issue is the function responseReadNamespacesArray of the file src/client/ua_client_connect.c of the component Shared Client Library. Such manipulation of the argument Server_NamespaceArray leads to null pointer dereference. The attack can be executed remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit is publicly available and might be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13open62541no fix listedDEBIAN-CVE-2026-15690
Debian:14open62541no fix listedDEBIAN-CVE-2026-15690
Ubuntu:26.04:LTSopen62541no fix listedUBUNTU-CVE-2026-15690
Ubuntu:26.10open62541no fix listedUBUNTU-CVE-2026-15690

Affected products (as reported)

VendorProductVersions
n/a open62541 1.5.01.5.11.5.21.5.31.5.41.5.5

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References