Vulnerability · Published Aug 4, 2026 · Assigned by mitre
CVE-2026-67855
High 7.5
In plain English
A high-severity uncontrolled resource consumption in the open62541 package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
open62541 contains a heap use-after-free in the GDS PushManagement certificate update workflow when UA_ENABLE_GDS_PUSHMANAGEMENT is enabled. This allows a remote attacker to cause a denial of service.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | open62541 | no fix listed | DEBIAN-CVE-2026-67855 |
| Debian:14 | open62541 | no fix listed | DEBIAN-CVE-2026-67855 |
| Ubuntu:26.04:LTS | open62541 | no fix listed | UBUNTU-CVE-2026-67855 |
| Ubuntu:26.10 | open62541 | no fix listed | UBUNTU-CVE-2026-67855 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/open62541/open62541
- https://github.com/open62541/open62541/issues/8093
- https://github.com/open62541/open62541/blob/master/src/server/ua_server_ns0_gds.c
- https://github.com/open62541/open62541/blob/master/arch/posix/eventloop_posix.c
- https://github.com/open62541/open62541/blob/master/src/server/ua_server_internal.h
- https://github.com/open62541/open62541/blob/master/examples/encryption/server_encryption.c