Medium [CVE-2026-63362] Denial of Service via unsigned integer underflow
This medium-severity Red Hat Linux advisory covers CVE-2026-63362.
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Summary
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. A flaw was found in open62541.
This vulnerability could make the affected system unavailable to legitimate users. This Moderate severity flaw in open62541 can lead to a denial of service.
The high attack complexity associated with this vulnerability reduces the likelihood of successful exploitation. This component is only present in Fedora.
Red Hat does not ship this component in any core Red Hat products. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-191.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Fedora ships version 1.5.6 which already includes the fix.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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