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Public proof of conceptAwaiting NVD analysis

CVE-2026-36499

A public proof of concept exists; no exploitation attested.

  • Published2026-06-04
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads. This can cause a denial of service (DoS) via resource exhaustion.

Timeline

dates in UTC
  1. 2026-06-0419:16CVE publishedNVD

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openvswitchUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • openvswitchUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • openvswitchUbuntu:26.10all versions · no fixed version listed
  • openvswitchUbuntu:26.04:LTSall versions · no fixed version listed
  • openvswitchUbuntu:25.10all versions · no fixed version listed
  • openvswitchUbuntu:24.04:LTSall versions · no fixed version listed
  • openvswitchUbuntu:22.04:LTSall versions · no fixed version listed
  • openvswitchUbuntu:20.04:LTSall versions · no fixed version listed

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-36499 Red Hat Product Security155 known affected

    openvswitch: Open vSwitch: Denial of service via resource exhaustion due to missing upper-bound check

    openvswitch3.5-devel as a component of Fast Datapath for RHEL 10 · openvswitch3.5-ipsec as a component of Fast Datapath for RHEL 10 · openvswitch3.5-test as a component of Fast Datapath for RHEL 10 · +152 more

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2026-36499 · 155 productsFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2026-06-04
Last Modified
2026-07-22
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-87x4-f37w-27p2

Frequently asked questions

What is CVE-2026-36499?

A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads. This can cause a denial of service (DoS) via resource exhaustion.

Is CVE-2026-36499 actively exploited?

A proof-of-concept exploit exists for CVE-2026-36499, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-36499?

CVE-2026-36499 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record