CVE-2026-36499Public exploitNetwork attack vector

Authenticated daemon crash via unbounded thread counts

Published Jun 4, 2026 · Updated Jun 4, 2026

Resource-exhaustion DoS in Open vSwitch 3.6.90 allows remote authenticated users to crash ovs-vswitchd through OVSDB configuration writes. udpif_set_threads() accepts unbounded n-handler-threads or n-revalidator-threads values and attempts to create the requested threads. OVSDB write access is required; exhausting file descriptors or thread resources aborts the daemon and interrupts switching.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-exhaustion DoS in Open vSwitch 3.6.90 allows remote authenticated users to crash ovs-vswitchd through OVSDB configuration writes. udpif_set_threads() accepts unbounded n-handler-threads or n-revalidator-threads values and attempts to create the requested threads. OVSDB write access is required; exhausting file descriptors or thread resources aborts the daemon and interrupts switching.

The record

CVE
CVE-2026-36499
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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 buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

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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