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CriticalVulnerabilityCVE-2026-43838updated 25 Oct 2026, 15:20 UTC

Login feature has a memory flaw that can let attackers run code

A bug in the login code can let an outside attacker overwrite memory and make the system run their own commands. Anyone who can reach the login page may be able to take over the affected system.

Official, 2 sources
SeverityCriticalCVSS 9.2 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

How the attack works simplified

  1. 1AttackerSends crafted input to login
  2. 2Login requestOversized data reaches login code
  3. 3Buffer overflowData overwrites stack memory
  4. 4Code executionAttacker's code runs on server
  5. ResultAttacker controls the server

What happened

A stack-based buffer overflow in the login functionality of the affected product allows arbitrary code execution. The exact product and versions are not stated in the available material.

Why it is dangerous: Successful exploitation gives the attacker code execution on the server, which can mean full control of the system and its data. Any organization running the affected product with a reachable login interface is at risk.

Are you affected?

You are affected if you run the affected product with its login functionality exposed to untrusted users (affected versions not specified in the available sources).

What to do

  1. Check the GitHub Advisory GHSA-fq83-7mp6-587m for the affected product name and versions
  2. Update the affected product to the fixed version named in the advisory as soon as it is available
  3. Restrict access to the login interface (for example, limit it to trusted networks or place it behind a VPN) until patched
  4. Monitor logs for unusual login attempts or unexpected process activity

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-2026-43838 · GHSA-fq83-7mp6-587m
CVSS
9.2 / 10
EPSS
0.4% 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

Login feature has a memory flaw that can let attackers run code · Zero Radar