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CriticalVulnerabilityCVE-2026-43844updated 25 Oct 2026, 15:20 UTC

Authentication bypass in a proprietary protocol

Someone could potentially get past the login check without valid credentials. Whether this affects you depends on which product uses this protocol.

Official, 2 sources
SeverityCriticalCVSS 9.3 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

What happened

A flaw in a proprietary protocol allows an attacker to bypass the authentication mechanism. Exact affected product versions are not stated in the available material.

Why it is dangerous: A successful bypass could let an unauthenticated attacker access protected functions or data, and the critical severity (CVSS 9.3) means the impact is considered very serious.

Are you affected?

You are affected if you run a product that implements the vulnerable proprietary protocol, but the specific products and versions are unknown from the available material.

What to do

  1. Identify whether any software in your environment uses this proprietary protocol, and check with the vendor for affected versions
  2. Check the GitHub Advisory GHSA-774f-v9xr-4j7c and the vendor's security notices for an update or patch
  3. Apply the vendor's fix as soon as it is available, and limit network access to the affected service in the meantime

Timeline

  1. 20 Oct 2026, 09:17 UTC
    Publicly disclosed
  2. 20 Oct 2026, 09:17 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 15:20 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-43844 · GHSA-774f-v9xr-4j7c
CVSS
9.3 / 10
EPSS
0.5% chance of exploitation within 30 days
Disclosed
20 Oct 2026, 09:17 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 15:20 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Authentication bypass in a proprietary protocol · Zero Radar