How severe is CVE-2026-35091?

CVE-2026-35091 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-35091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35091?

CVE-2026-35091 primarily affects Redhat Openshift. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-35091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35091 have an EU (EUVD) identifier?

Yes. CVE-2026-35091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17879.

When was CVE-2026-35091 published?

CVE-2026-35091 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-35091

CVE-2026-35091 is a high-severity vulnerability in Redhat Openshift with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-253.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17879
Weakness: CWE-253
Affected product: Redhat Openshift
Published: 2026-04-01
Last modified: 2026-06-17

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

Frequently asked questions

What is 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
How severe is CVE-2026-35091?: CVE-2026-35091 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-35091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35091?: CVE-2026-35091 primarily affects Redhat Openshift. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-35091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35091 have an EU (EUVD) identifier?: Yes. CVE-2026-35091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17879.
When was CVE-2026-35091 published?: CVE-2026-35091 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:corosync:corosync:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

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