CVE-2026-5426

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.00% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 62.8% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-10-26.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-16 15:18Z6 MO AGO

Last updated

2026-05-27 14:53Z5 MO AGO

Reserved

2026-04-02

Assigning CNA

Mandiant

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

• CWE-321Use of Hard-coded Cryptographic KeyVariant
• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

23679f911246b59628c13e7238158e2d4d99dd73b211a4c7e2aa9ca27d464e19

• github.comhttps://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0009.mdthird-party-advisory
• www.digital-knowledge.co.jphttps://www.digital-knowledge.co.jp/product/kd/product
• cloud.google.comhttps://cloud.google.com/blog/topics/threat-intelligence/knowledgedeliver-viewstate-deserialization-vulnerabilitythird-party-advisory