Critical RCE/DoS in an enterprise database server (Hitachi HiRDB) affecting multiple released versions; high CVSS and vendor advisory published warrants org‑wide notice.
CVE-2026-82120
Heap buffer overflow in Hitachi HiRDB allowing RCE or crash on affected server versions.
Is CVE-2026-82120 being exploited?
Not confirmed. CVE-2026-82120 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-82120?
CVE-2026-82120 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-82120?
Yes. A fix has been recorded for CVE-2026-82120. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-82120 affect?
CVE-2026-82120 affects Hitachi HiRDB Server v10 (versions before 10-12-01), Hitachi HiRDB Server v9 (09-00 through 09-66-22), HiRDB Server with Additional Function v9 (09-00 through 09-66/V), HiRDB Server v9(32) and Additional Function v9(32) (affected ranges as above). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-82120?
Apply vendor patch immediately; restrict DB access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap overflow in HiRDB can enable remote code execution or denial of service via crafted requests to the DB server.
Immediate action required
- affected>= 10-00 and < 10-12-01
- affected>= 09-00 and <= 09-66-22
- affected>= 09-02 and <= 09-66-22
- affected>= 09-00 and <= 09-66/V
- affected>= 09-00 and <= 09-66-/V
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.