CVE-2026-35091Suited to automated attack · CISA

Corosync: corosync: denial of service and information disclosure via crafted udp packet

CVSS score

8.2

EPSS probability

%1.1

Risk score

0.1

Published

6 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-35091 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-35091 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Red Hat	Red Hat Enterprise Linux 10	View
2	Red Hat	Red Hat Enterprise Linux 10	View
3	Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	View
4	Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	View
5	Red Hat	Red Hat Enterprise Linux 8	View
6	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	View
7	Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	View
8	Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	View
9	Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	View
10	Red Hat	Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions	View
11	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	View
12	Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	View
13	Red Hat	Red Hat Enterprise Linux 9	View
14	Red Hat	Red Hat Enterprise Linux 9	View
15	Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	View
16	Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	View
17	Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	View
18	Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	View
19	Red Hat	Red Hat OpenShift Container Platform 4	View
20	corosync	corosync	View
21	redhat	openshift	View
22	redhat	enterprise linux	View
23	redhat	enterprise linux	View
24	redhat	enterprise linux	View
25	redhat	enterprise linux	View

Total affected vendors: 3|Products: 25

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.2	CVSS V3_1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H	CVE CNA
8.2	CVSS V31	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-35091 is associated with the following CWEs:

CWE-253: Common Weakness Enumeration Entry CWE-253

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-35091 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

RHSA-2026:13644vendor-advisory RHSA-2026:13657vendor-advisory RHSA-2026:13673vendor-advisory RHSA-2026:14205vendor-advisory RHSA-2026:14210vendor-advisory RHSA-2026:14211vendor-advisory RHSA-2026:14212vendor-advisory RHSA-2026:14213vendor-advisory RHSA-2026:14214vendor-advisory RHSA-2026:14215vendor-advisory

CVSS Vector Radar Chart

8.2 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

Red Hat

corosync

redhat

Weakness Type (CWE & CAPEC)

CWE-253

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