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Vulnerability · Published Aug 4, 2026 · Assigned by VulDB

CVE-2026-18785o6 open62541 client_types_custom.c UA_Client_getRemoteDataTypes use after free

Medium 5.3

In plain English

A medium-severity use-after-free 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 5% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 95.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b. Impacted is the function UA_Client_getRemoteDataTypes of the file examples/custom_datatype/client_types_custom.c. Executing a manipulation can lead to use after free. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. 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-2026-18785
Debian:14open62541no fix listedDEBIAN-CVE-2026-18785
Ubuntu:26.04:LTSopen62541no fix listedUBUNTU-CVE-2026-18785
Ubuntu:26.10open62541no fix listedUBUNTU-CVE-2026-18785

Affected products (as reported)

VendorProductVersions
o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b

Weakness: CWE-416, 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