HOMEVULNERABILITIESCVE-2026-35091
HIGH

CVE-2026-35091

CWE-253Published: April 1, 2026· Updated: Apr 7, 2026

8.2
CVSS v3.1
EPSS:0.08%probability of exploitation in 30 daysPercentile:23.4th

Official 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. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration.

NVD Source

Technical Analysis

CVE-2026-35091 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected Vendors & Products

corosync1 product
corosync
Red Hat2 products
openshiftenterprise linux
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-35091
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2453169

All References (3)

→
https://access.redhat.com/security/cve/CVE-2026-35091Third Party Advisory · VDB Entry
→
https://bugzilla.redhat.com/show_bug.cgi?id=2453169Exploit · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2453813Issue Tracking

Quick Facts

CVE IDCVE-2026-35091
CVSS Score8.2 / 10
SeverityHIGH
WeaknessCWE-253
CISA KEVNo
EPSS (30d)0.08%
Affected2 vendors
PublishedApr 1, 2026

Related CVEs (CWE-253)

CVE-2026-46419
7.5
CVE-2026-5818
7.2
CVE-2026-35340
5.5
CVE-2026-35339
5.5
CVE-2026-43863
3.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-35091 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-35091·NVD