CVE WatchSep 4, 2026

CVE-2026-81666

An integer overflow was found in Corosync's handling of membership commit token messages. The length-validation check for these messages can

CVSS

6.5

Medium

EPSS

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KEV

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Exploit Today

0-100

Published: Sep 4, 2026 · Last modified: Sep 4, 2026 · CWE-190

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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