Vulnerability · Published Aug 4, 2026 · Assigned by mitre
CVE-2026-67859
High 7.5
In plain English
A high-severity buffer overflow 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 0.8% (higher than 57% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 42.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Buffer Overflow vulnerability in open62541 v1.5.5 allows a remote attacker to cause a denial of service via the Discovery/LDS handling.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | open62541 | no fix listed | DEBIAN-CVE-2026-67859 |
| Debian:14 | open62541 | no fix listed | DEBIAN-CVE-2026-67859 |
| Ubuntu:26.04:LTS | open62541 | no fix listed | UBUNTU-CVE-2026-67859 |
| Ubuntu:26.10 | open62541 | no fix listed | UBUNTU-CVE-2026-67859 |
Affected products (as reported)
Weakness: CWE-120 · Vector: CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
References
- https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c
- https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c
- https://github.com/open62541/open62541/issues/8095
- https://github.com/open62541/open62541/blob/master/examples/discovery/server_lds.c
- https://github.com/open62541/open62541/blob/master/src/util/ua_util.c