CVE-2026-35092
published 2026-04-01CVE-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…
PriorityP346high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.99%
58.8th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | corosync | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | openshift | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH
vendor_ubuntu8.2HIGH
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
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Ubuntu
Corosync vulnerabilities
vendor_ubuntu·2026-04-13·CVSS 8.2
CVE-2026-35092 [HIGH] Corosync vulnerabilities
Title: Corosync vulnerabilities
Summary: Several security issues were fixed in Corosync.
It was discovered that Corosync incorrectly handled the membership commit
token validity check. A remote attacker could use this issue to cause
Corosync to crash, resulting in a denial of service, or to possibly obtain
a small quantity of sensitive information. (CVE-2026-35091)
It was discovered that Corosync incorrectly handled join message
validation. A remote attacker could possibly use this issue to cause
Corosync to crash, resulting in a denial of service. (CVE-2026-35092)
Instructions: After a standard system update you need to restart Corosync to make all the
necessary changes.
Red Hat
corosync: Corosync: Denial of Service via integer overflow in join message validation
vendor_redhat·2026-04-01·CVSS 7.5
CVE-2026-35092 [HIGH] CWE-190 corosync: Corosync: Denial of Service via integer overflow in join message validation
corosync: Corosync: Denial of Service via integer overflow in join message validation
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.
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
Debian
CVE-2026-35092: corosync - A flaw was found in Corosync. An integer overflow vulnerability in Corosync's jo...
vendor_debian·2026·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092: corosync - A flaw was found in Corosync. An integer overflow vulnerability in Corosync's jo...
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.
Scope: local
bookworm: open
bullseye: open
forky: open
sid: open
trixie: open
OSV
CVE-2026-35092: (A flaw was found in Corosync
osv·2026-04-02·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092: (A flaw was found in Corosync
(A flaw was found in Corosync. An integer overflow vulnerability in Cor ...)
GHSA
GHSA-g4g9-h6f9-v5x2: A flaw was found in Corosync
ghsa_unreviewed·2026-04-01
CVE-2026-35092 [HIGH] CWE-190 GHSA-g4g9-h6f9-v5x2: A flaw was found in 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.
OSV
CVE-2026-35092: A flaw was found in Corosync
osv·2026-04-01·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092: A flaw was found in 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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation [fedora-all]
bugzilla·2026-04-01·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation [fedora-all]
CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
FEDORA-2026-e34a334e81 (corosync-3.1.10-5.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-e34a334e81
---
FEDORA-2026-ee4ff58256 (corosync-3.1.10-2.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ee4ff58256
---
FEDORA-2026-95ee0edcd5 (corosync-3.1.9-4.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.
Bugzilla
CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation
bugzilla·2026-04-01·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation
CVE-2026-35092 corosync: Corosync: Denial of Service via integer overflow in join message validation
Integer overflow (wraparound) vulnerability in Corosync’s join message sanity validation in exec/totemsrp.c. The flaw is in check_memb_join_sanity(), where proc_list_entries and failed_list_entries are attacker-controlled 32-bit unsigned values received from the network and are added together before being promoted to size_t. This allows the addition (proc_list_entries + failed_list_entries) to wrap around in 32-bit arithmetic (e.g., 0x80000000 + 0x80000000 = 0), causing required_len to be calculated too small and allowing a short packet to pass validation. As a result, Corosync proceeds with processing malformed input that should have been rejected, which can be exploited remotely without
Wiz
CVE-2026-35092 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.5
CVE-2026-35092 [HIGH] CVE-2026-35092 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-35092 :
Linux Debian vulnerability analysis and mitigation
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.
Source : NVD
## 7.5
Score
Published April 1, 2026
Severity HIGH
CNA Score 7.5
Affected Technologies
Linux Debian
Linux Red Hat
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 22.3
Exploitation Probability (EPSS) 0.1
Affected packages and lib
https://access.redhat.com/errata/RHSA-2026:13644https://access.redhat.com/errata/RHSA-2026:13657https://access.redhat.com/errata/RHSA-2026:13673https://access.redhat.com/errata/RHSA-2026:14205https://access.redhat.com/errata/RHSA-2026:14210https://access.redhat.com/errata/RHSA-2026:14211https://access.redhat.com/errata/RHSA-2026:14212https://access.redhat.com/errata/RHSA-2026:14213https://access.redhat.com/errata/RHSA-2026:14214https://access.redhat.com/errata/RHSA-2026:14215https://access.redhat.com/errata/RHSA-2026:14216https://access.redhat.com/errata/RHSA-2026:19043https://access.redhat.com/errata/RHSA-2026:19200https://access.redhat.com/errata/RHSA-2026:20916https://access.redhat.com/security/cve/CVE-2026-35092https://bugzilla.redhat.com/show_bug.cgi?id=2453169https://bugzilla.redhat.com/show_bug.cgi?id=2453814
2026-04-01
Published