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Corosync CVE-2026-81666

| EUVDEUVD-2026-70987 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-09-04 redhat GHSA-8297-6g53-8gp5
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.3 MEDIUM

AC:H reflects the 32-bit-only deployment constraint, a pre-existing condition beyond the attacker's control; all other metrics match the vendor-supplied vector.

3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Metadata Corrected
Sep 04, 2026 - 10:40 vuln.today
tag: Corosync added
Analysis Generated
Sep 04, 2026 - 10:25 vuln.today
CVE Published
Sep 04, 2026 - 09:46 nvd
MEDIUM 6.5

DescriptionCVE.org

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.

AnalysisAI

Integer overflow in Corosync's membership commit token processing crashes the daemon on 32-bit cluster nodes, enabling a denial-of-service attack from any adjacent network host. The CWE-190 flaw causes the length validation to be bypassed on 32-bit systems where arithmetic wraps before the bounds check is applied, resulting in an out-of-bounds memory access that kills the Corosync process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The target system must be running a 32-bit operating system - the integer overflow in the Corosync message length calculation occurs only under the ILP32 ABI where 32-bit arithmetic wraps before the bounds check; 64-bit systems are explicitly immune. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is moderate and substantially narrowed by the 32-bit-only constraint. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Corosync RPM errata from Red Hat for the relevant RHEL major version (7, 8, 9, or 10) or OpenShift Container Platform 4 via standard yum/dnf update channels once Red Hat publishes the security advisory - consult https://access.redhat.com/security/cve/CVE-2026-81666 for errata status and exact patched package versions, which are not yet confirmed in the available data. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Availability Extension 15 SP4 Affected
SUSE Linux Enterprise High Availability Extension 15 SP5 Affected
SUSE Linux Enterprise High Availability Extension 15 SP6 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected

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CVE-2026-81666 vulnerability details – vuln.today

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