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
Affected products
corosync: corosync; redhat: openshift; redhat: enterprise linux
References10
- bugzilla.redhat.com/show_bug.cgi?id=2453169 ExploitThird Party Advisory
- access.redhat.com/errata/RHSA-2026:13644
- access.redhat.com/errata/RHSA-2026:13657
- access.redhat.com/errata/RHSA-2026:13673
- access.redhat.com/errata/RHSA-2026:14205
- access.redhat.com/errata/RHSA-2026:14210
- access.redhat.com/errata/RHSA-2026:14211
- access.redhat.com/errata/RHSA-2026:14212
- access.redhat.com/errata/RHSA-2026:14213
- access.redhat.com/errata/RHSA-2026:14214
Metrics
- CVSS 3.1
-
8.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - EPSS — exploit probability
- 1% percentile: 60 · as of 12 November 2026
- CWE
- CWE-253
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.