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CVE-2026-63362

HIGHCVSS 8.2/10EPSS 1.53%

Last modified

CVE-2026-63362 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0
8.2/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
1.53%

72.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
o6 Automationopen62541>= 1.3.0, <= 1.3.17; >= 1.4.0, <= 1.4.16; >= 1.5.0, <= 1.5.4; master

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-63362?
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.
How severe is CVE-2026-63362?
CVE-2026-63362 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63362?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST