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 can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.011 (65.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.011 · change: +0.002
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
- access.redhat.com/security/cve/CVE-2026-35091 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (Exploit, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)
- access.redhat.com/errata/RHSA-2026:13644 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:13657 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:13673 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:14205 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:14214 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:14215 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:14216 (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.