CVE-2026-35091

high

Published 2026-05-05 · Modified 2026-05-05

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CVSS v3

8.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.2

Description

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

Predictions

Exploit likelihood

88%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-35091 NameCVE-2026-35091 DescriptionA 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…

CVE-2026-35091

Name	CVE-2026-35091
Description	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
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4608-1, DSA-6261-1
Debian Bugs	1133838

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
corosync (PTS)	bullseye	3.1.2-2	vulnerable
	bullseye (security)	3.1.2-2+deb11u2	fixed
	bookworm, bookworm (security)	3.1.7-1+deb12u2	fixed
	trixie (security), trixie	3.1.9-2+deb13u1	fixed
	forky, sid	3.1.10-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
corosync	source	bullseye	3.1.2-2+deb11u2	DLA-4608-1
corosync	source	bookworm	3.1.7-1+deb12u2	DSA-6261-1
corosync	source	trixie	3.1.9-2+deb13u1	DSA-6261-1
corosync	source	(unstable)	3.1.10-2		1133838

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2453813
https://bugzilla.redhat.com/show_bug.cgi?id=2453169
https://github.com/corosync/corosync/commit/a16614accfdb3481264d7281843fadf439d9ab1b

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2453813https://bugzilla.redhat.com/show_bug.cgi?id=2453169https://github.com/corosync/corosync/commit/a16614accfdb3481264d7281843fadf439d9ab1b

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Red Hat Mixed 6 releases

Version	Status	Fixed in
10.0	Affected	—
9.0	Affected	—
9	Fixed	—
8.0	Affected	—
8	Fixed	—
7.0	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`3.1.9-2+deb13u1`
sid	Fixed	`3.1.10-2`
forky	Fixed	`3.1.10-2`
bullseye	Fixed	`3.1.2-2+deb11u2`
bookworm	Fixed	`3.1.7-1+deb12u2`

Rocky Linux Fixed 1 release

Version	Status	Fixed in
9	Fixed	—

Application impact

Vendor	Product	Versions	Fixed
corosync	corosync	`-`
redhat	openshift	`4.0`

References

CWEs

CWE-253

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.