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CriticalVulnerabilityCVE-2026-82120updated 27 Oct 2026, 13:18 UTC

HiRDB database server has a memory overflow flaw that can let attackers take control

A flaw in the HiRDB database server lets specially crafted data overwrite parts of the server's memory. That can let an attacker crash the database or potentially run their own commands on it.

Partial fixOfficial, 2 sources
SeverityCriticalCVSS 9.8 of 10
Being exploited?UnclearNo reports either way yet
Fix available?PartlyHiRDB Server Version 10: 10-12-01 or later. Fixed versions for Version 9 are not stated in the provided material. · since 27 Oct 2026
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1AttackerSends crafted request to the database
  2. 2Network accessReaches the HiRDB service port
  3. 3Buffer overflowOversized input overwrites heap memory
  4. 4Server compromisedMemory corruption can enable code execution
  5. ResultAttacker may control the database server

What happened

A heap-based buffer overflow in HiRDB Server Versions 9 and 10 and their Additional Function variants allows memory corruption from crafted input.

Why it is dangerous: Attackers who can reach the database service over the network could exploit this to disrupt or fully compromise the server, exposing the data it stores.

Are you affected?

You are affected if you run HiRDB Server Version 10 before 10-12-01, or HiRDB Server Version 9 (including 9(32) and with Additional Function) in the affected 09-xx ranges listed below.

HiRDB Server Version 10: 10-00 before 10-12-01; HiRDB Server Version 9: 09-00 through 09-66-22; HiRDB Server with Additional Function Version 9: 09-00 through 09-66/V; HiRDB Server Version 9(32): 09-02 through 09-66-22; HiRDB Server with Additional Function Version 9(32): 09-00 through 09-66-/V

What to do

  1. Identify every HiRDB Server instance and its exact version, including Additional Function and 9(32) builds
  2. Update HiRDB Server Version 10 to 10-12-01 or later
  3. Check the vendor advisory for the fixed release of Version 9 builds and apply it, or plan a migration to a supported version
  4. Restrict network access to the HiRDB service to trusted hosts until patched

Timeline

  1. 27 Oct 2026, 10:16 UTC
    Publicly disclosed
  2. 27 Oct 2026, 10:16 UTC
    Reported by NVD · NVD
  3. 27 Oct 2026, 10:17 UTC
    Picked up by Zero Radar
  4. 27 Oct 2026, 13:18 UTC
    GitHub Advisory reported on it · GitHub Advisory
  5. 27 Oct 2026, 13:18 UTC
    Fix: HiRDB Server Version 10: 10-12-01 or later. Fixed versions for Version 9 are not stated in the provided material.

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-82120 · GHSA-hvgj-c5wh-75j5
CVSS
9.8 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
27 Oct 2026, 10:16 UTC
On Zero Radar
27 Oct 2026, 10:17 UTC (1 min after disclosure)
Last change
27 Oct 2026, 13:18 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

HiRDB database server has a memory overflow flaw that can let attackers take control · Zero Radar