OPENSUSE-SU-2026:21887-1: corosync security update

OPENSUSE-SU-2026:21887-1, released September 20, 2026, fixes 2 CVEs in corosync (version 3.1.9-160000.4.1). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.5

Base score, 0 to 10

Highest EPSS

0.0042

36th percentile

Priority of the 2 CVEs

Patch now 0
                                Urgent 0
                                High 1
                                Routine 1

Fixed package versions

Product	Release	Fixed in
corosync	opensuse-leap 16.0	3.1.9-160000.4.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-81665	corosync: A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly	7.5	0.0042	None reported
Routine	CVE-2026-81666	corosync: This update for corosync fixes the following issues: - CVE-2026-81665: heap-based buffer overflow in totempg assembl...	n/a	0.0025	None reported

Also fixes CVE-2026-81665

SUSE-SU-2026:23850-1
corosync on sles 16.0
SUSE-SU-2026:4202-1
corosync on sles 15.6, sles 15.7
ELSA-2026-67872
corosync, corosync-vqsim, corosynclib on ol 10
ALAS2023-2026-3138
corosync, corosync-debuginfo, corosync-debugsource and 5 more on amzn 2023
RLSA-2026:69277
corosync on rocky 8
ELSA-2026-69277
corosync, corosync-vqsim, corosynclib on ol 8
RHSA-2026:69277
corosync, corosync-vqsim, corosynclib and 2 more on RHEL 8
ELSA-2026-67873
corosync, corosync-vqsim, corosynclib on ol 9

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21887-1

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