Vulnerability in Corosync
CVE-2026-35091
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 ca…
EPSS: 0.003 (52.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
Affected products
- Corosync
- Red Hat Enterprise Linux 10 — versions 0:3.1.10-1.el10_2.1, 0:3.1.9-2.el10_1.1
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:3.1.9-1.el10_0.2
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:2.4.5-7.el7_9.3
- Red Hat Enterprise Linux 8 — versions 0:3.1.8-1.el8_10.1
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:3.1.0-3.el8_4.2
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-life Add-on — versions 0:3.1.0-3.el8_4.2
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:3.1.5-2.el8_6.1
- Red Hat Enterprise Linux 8.6 Telecommunications Update Service — versions 0:3.1.5-2.el8_6.1
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, VDB Entry, Third Party Advisory, vdb-entry)
- secalert@redhat.com (Exploit, Third Party Advisory)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
Frequently asked questions
- What is CVE-2026-35091?
- CVE-2026-35091 is a high-severity vulnerability in Corosync, classified under CWE-253. CVSS score: 8.2/10. Published 2026-04-01.
- How severe is CVE-2026-35091?
- High severity. CVSS v3 base score is 8.2 out of 10.