CVE-2026-35092Network attack vector

Service crash via wrapped join-message length

Published Apr 1, 2026 · Updated Apr 1, 2026

Integer overflow in Corosync join-message validation allows remote attackers to crash the service with crafted UDP packets. In exec/totemsrp.c, check_memb_join_sanity() adds attacker-controlled 32-bit proc_list_entries and failed_list_entries before promotion to size_t, so wraparound understates required_len and admits a short packet. Unauthenticated network access reaches the flaw only when Corosync uses totemudp or totemudpu mode; the bounded consequence is a service crash.

CVSS severity7.5
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Corosync join-message validation allows remote attackers to crash the service with crafted UDP packets. In exec/totemsrp.c, check_memb_join_sanity() adds attacker-controlled 32-bit proc_list_entries and failed_list_entries before promotion to size_t, so wraparound understates required_len and admits a short packet. Unauthenticated network access reaches the flaw only when Corosync uses totemudp or totemudpu mode; the bounded consequence is a service crash.

The record

CVE
CVE-2026-35092
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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