Summary
It was discovered that Corosync incorrectly handled the membership commit
token validity check. A remote attacker could use this issue to cause
Corosync to crash, resulting in a denial of service, or to possibly obtain
a small quantity of sensitive information. (CVE-2026-35091)
It was discovered that Corosync incorrectly handled join message
validation. A remote attacker could possibly use this issue to cause
Corosync to crash, resulting in a denial of service. (CVE-2026-35092)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | corosync | 3.1.6-1ubuntu1.2 |
| Ubuntu · 24.04 LTS 24.04:LTS | corosync | 3.1.7-1ubuntu3.2 |
| Ubuntu · 25.10 | corosync | 3.1.9-2ubuntu1.1 |
Vulnerabilities 2
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High 8.2
Corosync: corosync: denial of service and information disclosure via crafted udp packet
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-…
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High 7.5
Corosync: corosync: denial of service via integer overflow in join message validation
A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a deni…