What is CVE-2026-81657?

CVE-2026-81657 is a critical-severity vulnerability in IBM Guardium Data Protection, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-09-18.

How severe is CVE-2026-81657?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in IBM Guardium Data Protection

CVE-2026-81657

IBM Guardium Data Protection 12.2 could allow a remote unauthenticated attacker to execute arbitrary code on the system due to the deserialization of untrusted data.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Guardium Data Protection — versions 12.2

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-81657?: CVE-2026-81657 is a critical-severity vulnerability in IBM Guardium Data Protection, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-09-18.
How severe is CVE-2026-81657?: Critical severity. CVSS v3 base score is 9.8 out of 10.