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CVE-2026-35091

Corosync vulnerability

8.2 HIGHPublic exploitEPSS 1.09%
  1. Published1 Apr 2026

Description

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected products

Corosyncall versions
Redhat Openshift4.0
Redhat Enterprise Linux10.0 · 7.0 · 8.0 · 9.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

and 7 more references

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Frequently asked

Is CVE-2026-35091 being actively exploited?

CVE-2026-35091 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.09%.

How severe is CVE-2026-35091?

CVE-2026-35091 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 1.09% probability of exploitation.

Which products are affected by CVE-2026-35091?

Affected products include Corosync, Redhat Openshift, Redhat Enterprise Linux.

How do I fix CVE-2026-35091?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-35091 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.