CVE-2026-63362

Publication date 30 July 2026

Last updated 7 August 2026

Ubuntu priority

Cvss 3 Severity Score

Description

An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
open62541	26.04 LTS resolute	Needs evaluation
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release

Severity score breakdown

CVSS version:

Base score 8.2 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Attack requirements	None
Privileges required	None
User interaction	None
Vulnerable system - Confidentiality impact	None
Vulnerable system - Integrity impact	None
Vulnerable system - Availability impact	High
Subsequent system - Confidentiality impact	None
Subsequent system - Integrity impact	None
Subsequent system - Availability impact	None

Scores

Parameter	Value
Base score	8.2 · High
Base + Threat score	-
Base + Environmental score	-
Base + Threat + Environmental score	-

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Base score 5.9 · Medium