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Vulnerability · Published Aug 4, 2026 · Assigned by VulDB

CVE-2026-18784o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

Medium 5.3

In plain English

A medium-severity heap buffer overflow in open62541 from o6. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 93.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could 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-2026-18784
Debian:14open62541no fix listedDEBIAN-CVE-2026-18784
Ubuntu:26.04:LTSopen62541no fix listedUBUNTU-CVE-2026-18784
Ubuntu:26.10open62541no fix listedUBUNTU-CVE-2026-18784

Affected products (as reported)

VendorProductVersions
o6 open62541 1.5.01.5.11.5.21.5.31.5.41.5.5

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References