Integer overflow in Corosync
CVE-2026-35092
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 denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.013 (68.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.013 · change: +0.003
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-2026-35092 (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, Third Party Advisory, 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-2026-35092?
- CVE-2026-35092 is a high-severity vulnerability in Corosync, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-04-01.
- How severe is CVE-2026-35092?
- High severity. CVSS v3 base score is 7.5 out of 10.