CVE-2026-35091Network attack vector

Service crash and memory disclosure via undersized token

Published Apr 1, 2026 · Updated Apr 1, 2026

Incorrect return-value handling in Corosync allows remote attackers to crash the service or read limited memory via a crafted UDP packet. In exec/totemsrp.c, check_memb_commit_token_sanity() returns success for a truncated membership commit token, so the handler allocates the short message and reads fields beyond that region. A single unauthenticated packet can reach the flaw on UDP port 5405 when totemudp or totemudpu transport is active; that transport is the default.

CVSS severity8.2
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect return-value handling in Corosync allows remote attackers to crash the service or read limited memory via a crafted UDP packet. In exec/totemsrp.c, check_memb_commit_token_sanity() returns success for a truncated membership commit token, so the handler allocates the short message and reads fields beyond that region. A single unauthenticated packet can reach the flaw on UDP port 5405 when totemudp or totemudpu transport is active; that transport is the default.

The record

CVE
CVE-2026-35091
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-253, T1499
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

8.2Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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-253Incorrect Check of Function Return Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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