CVE-2026-35091
moderate-risk
Published 2026-04-01
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. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration.
Do I need to act?
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0.34% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.2/10
High
NETWORK
/ LOW complexity
Affected Products (6)
References (3)
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-35091
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2453813
42
/ 100
moderate-risk
Severity
28/34 · Critical
Exploitability
1/34 · Minimal
Exposure
13/34 · Low