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    CVE-2026-35091

    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

    Published:Apr 1, 2026
    Last Modified:May 26, 2026
    EPS:Apr 1, 2026
    EPSS Score:0.00221
    CVSS Score:8.2

    Affected Products

    Vendor
    Corosync
    Product
    Corosync
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    https://bugzilla.redhat.com/show_bug.cgi?id=2453169

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-81665 (CVSS 7.5) — A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When pr…
    CVE-2026-81666 (CVSS 6.5) — An integer overflow was found in Corosync's handling of membership commit token messages. The length-validatio…
    CVE-2026-35092 (CVSS 7.5) — A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation a…
    CVE-2025-30472 (CVSS 9) — Corosync through 3.1.9, if encryption is disabled or the attacker knows the encryption key, has a stack-based …
    CVE-2018-1084 (CVSS 7.5) — corosync before version 2.4.4 is vulnerable to an integer overflow in exec/totemcrypto.c.…
    CVE-2013-0250 (CVSS 5) — The init_nss_hash function in exec/totemcrypto.c in Corosync 2.0 before 2.3 does not properly initialize the H…

    References

    https://access.redhat.com/errata/RHSA-2026:13644
    https://access.redhat.com/errata/RHSA-2026:13657
    https://access.redhat.com/errata/RHSA-2026:13673
    https://access.redhat.com/errata/RHSA-2026:14205
    https://access.redhat.com/errata/RHSA-2026:14210
    https://access.redhat.com/errata/RHSA-2026:14211
    https://access.redhat.com/errata/RHSA-2026:14212
    https://access.redhat.com/errata/RHSA-2026:14213
    https://access.redhat.com/errata/RHSA-2026:14214
    https://access.redhat.com/errata/RHSA-2026:14215
    https://access.redhat.com/errata/RHSA-2026:14216
    https://access.redhat.com/errata/RHSA-2026:19043
    https://access.redhat.com/errata/RHSA-2026:19200
    https://access.redhat.com/errata/RHSA-2026:20916
    https://access.redhat.com/security/cve/CVE-2026-35091
    https://bugzilla.redhat.com/show_bug.cgi?id=2453169
    https://bugzilla.redhat.com/show_bug.cgi?id=2453813

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High