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Vulnerability record · CVE-2026-35092 · published 1 April 2026

CVE-2026-35092: Corosync integer overflow vulnerability

Corosync · Corosync

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.

7.5 CVSS 3.1 High EPSS 1.3% · top 31.3% CWE-190 · Integer overflow
7.5CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
17References, 1 tagged exploit
21 Aug 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:13644
https://access.redhat.com/errata/RHSA-2026:13657
https://access.redhat.com/errata/RHSA-2026:13673
https://access.redhat.com/errata/RHSA-2026:14205
https://access.redhat.com/errata/RHSA-2026:14210
https://access.redhat.com/errata/RHSA-2026:14211
https://access.redhat.com/errata/RHSA-2026:14212
https://access.redhat.com/errata/RHSA-2026:14213
https://access.redhat.com/errata/RHSA-2026:14214
https://access.redhat.com/errata/RHSA-2026:14215
https://access.redhat.com/errata/RHSA-2026:14216
https://access.redhat.com/errata/RHSA-2026:19043
https://access.redhat.com/errata/RHSA-2026:19200
https://access.redhat.com/errata/RHSA-2026:20916
https://access.redhat.com/security/cve/CVE-2026-35092 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=2453169 ExploitThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2453814 Issue TrackingThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-35092), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.