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CVE-2026-81666

Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit systems

An integer overflow was found in Corosync's handling of membership commit token messages. The length-validation check for these messages can be bypassed on 32-bit systems due to an integer overflow in the calculation of the expected message length, allowing a crafted network packet to trigger an out-of-bounds memory access that crashes the Corosync daemon. This results in a denial of service for the affected cluster node. The overflow does not occur on 64-bit systems, where the length calculation is correctly performed in 64-bit arithmetic.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Corosync Redhat
Products
Corosync Enterprise Linux Openshift and 2 more
CVE-2026-81665

Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly

A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Corosync Redhat
Products
Corosync Enterprise Linux Enterprise Linux Eus and 7 more
CVE-2026-35091

Corosync: corosync: denial of service and information disclosure via crafted udp packet

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

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Corosync Redhat
Products
Corosync Enterprise Linux Enterprise Linux Eus and 7 more
CVE-2026-35092

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.

CVSS 3.1 · 7.5 High EPSS 1.0% KEV · Not listed
Vendors
Corosync Redhat
Products
Corosync Enterprise Linux Enterprise Linux Eus and 7 more
CVE-2025-30472

corosync: Stack buffer overflow from 'orf_token_endian_convert'

Corosync through 3.1.9, if encryption is disabled or the attacker knows the encryption key, has a stack-based buffer overflow in orf_token_endian_convert in exec/totemsrp.c via a large UDP packet.

CVSS 3.1 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
Corosync Redhat
Products
Corosync Enterprise Linux
CVE-2013-0250

2.x: Remote DoS due improper HMAC initialization

The init_nss_hash function in exec/totemcrypto.c in Corosync 2.0 before 2.3 does not properly initialize the HMAC key, which allows remote attackers to cause a denial of service (crash) via a crafted packet.

CVSS 2.0 · 5.0 Medium EPSS 3.1% KEV · Not listed
Vendors
Corosync
Products
Corosync