CVE-2026-63362CWE-191

CVE-2026-63362

Medium · published July 31, 2026

CVSS v3.1

5.9

EPSS

2%

Percentile

78.7

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 5.9 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0: Not supplied
EPSS: 0.01822 · 78.7th percentile
Weakness: CWE-191 · Integer Underflow (Wrap or Wraparound)
Published: 2026-07-31T03:16Z

References (7)

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json · [email protected]https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f · [email protected]https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60 · [email protected]https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e · [email protected]https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df · [email protected]https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08 · [email protected]https://www.o6-automation.com/contact · [email protected]

EPSS history

Timeline

30 JUL 22:01Z
o6 Automation open62541 Integer Underflow
cvelistv5