CVE-2026-81666
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
58/100
Published: 2026-09-04
Modified: 2026-11-06
First seen: 2026-11-03
Status: active
Attack Surface
Adjacent
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Adjacent
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.