Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-35091

CVE-2026-35091HIGH

Red Hat Red Hat Enterprise Linux 10 — Corosync: corosync: denial of service and information disclosure via crafted udp packet

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  H    8.2   .0109   64.3     —

AFFECTED
  Product                                                                Versions     Fixed
  Red Hat Enterprise Linux 10                                            unspecified  0:3.1.9-2.el10_1.1
  Red Hat Enterprise Linux 10                                            unspecified  0:3.1.10-1.el10_2.1
  Red Hat Enterprise Linux 10.0 Extended Update Support                  unspecified  0:3.1.9-1.el10_0.2
  Red Hat Enterprise Linux 7 Extended Lifecycle Support                  unspecified  0:2.4.5-7.el7_9.3
  Red Hat Enterprise Linux 8                                             unspecified  0:3.1.8-1.el8_10.1
  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support  unspecified  0:3.1.0-3.el8_4.2
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On  unspecified  0:3.1.0-3.el8_4.2
  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support  unspecified  0:3.1.5-2.el8_6.1
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service         unspecified  0:3.1.5-2.el8_6.1
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions         unspecified  0:3.1.5-2.el8_6.1
  + 9 more

TIMELINE
  Apr 1   Reserved by redhat
  Apr 1   Published (CNA: redhat)
  Aug 21  EXPLOIT PUBLISHED — CVE-2026-35091 (Red Hat Enterprise Linux 10). Public exploit reference added.

CWE-253 · CNA: redhat · CVSS v3.1 · 17 references · NVD status: Modified

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 1, 2026	Reserved	Reserved by redhat
April 1, 2026	Published	Published (CNA: redhat)
August 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-35091 (Red Hat Enterprise Linux 10). Public exploit reference added.

Affected

Affected products and packages — 19 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Enterprise Linux 10	—	—	0:3.1.9-2.el10_1.1
Red Hat	Red Hat Enterprise Linux 10	—	—	0:3.1.10-1.el10_2.1
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	—	—	0:3.1.9-1.el10_0.2
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	—	—	0:2.4.5-7.el7_9.3
Red Hat	Red Hat Enterprise Linux 8	—	—	0:3.1.8-1.el8_10.1
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	—	—	0:3.1.0-3.el8_4.2
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	—	—	0:3.1.0-3.el8_4.2
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	—	—	0:3.1.5-2.el8_6.1
Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	—	—	0:3.1.5-2.el8_6.1
Red Hat	Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions	—	—	0:3.1.5-2.el8_6.1
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	—	—	0:3.1.7-1.el8_8.1
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	—	—	0:3.1.7-1.el8_8.1
Red Hat	Red Hat Enterprise Linux 9	—	—	0:3.1.9-2.el9_7.1
Red Hat	Red Hat Enterprise Linux 9	—	—	0:3.1.10-1.el9_8.1
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	—	—	0:3.1.5-3.el9_0.1
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	—	—	0:3.1.7-1.el9_2.1
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	—	—	0:3.1.8-1.el9_4.1
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	—	—	0:3.1.9-2.el9_6.1
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-253

References (17)

Authoritative record: CVE-2026-35091 at cve.org

Vendors: red hat

Weaknesses: CWE-253

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-35091 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.