CVE-2026-66839

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

0.14% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 3.5% of scored records. A rank, not a probability.

NVD base score

8.4 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-28.

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

2026-08-05 04:26Z1 MO AGO

Last updated

2026-08-05 16:07Z1 MO AGO

Reserved

2026-07-28

Assigning CNA

jpcert

Record state

PUBLISHED

Severity

High (CVSS 8.4)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-428Unquoted Search Path or ElementBase

Data version

5.2

Document digest

7d85031aad305a90ac3985a2dd1e40019f54b417d3e9054143e35b7311eef356

• www.istinc.co.jphttps://www.istinc.co.jp/dl/jpc/DLL%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%81%AE%E8%AA%AD%E3%81%BF%E8%BE%BC%E3%81%BF%E3%81%8A%E3%82%88%E3%81%B3%E3%82%A4%E3%83%B3%E3%82%B9%E3%83%88%E3%83%BC%E3%83%AB%E3%83%95%E3%82%A9%E3%83%AB%E3%83%80%E3%81%AE%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B9%E6%A8%A9%E9%99%90%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B%E5%95%8F%E9%A1%8C%E3%81%A8%E5%AF%BE%E5%BF%9C.pdf
• www.istinc.co.jphttps://www.istinc.co.jp/dl/jpc/%E3%82%B5%E3%83%BC%E3%83%93%E3%82%B9%E3%81%AE%E5%AE%9F%E8%A1%8C%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%83%91%E3%82%B9%E3%81%8C%E5%BC%95%E7%94%A8%E7%AC%A6%E3%81%A7%E5%9B%B2%E3%81%BE%E3%82%8C%E3%81%A6%E3%81%84%E3%81%AA%E3%81%84%E3%81%93%E3%81%A8%E3%81%AB%E3%82%88%E3%82%8B%E6%A8%A9%E9%99%90%E6%98%87%E6%A0%BC%E3%81%AE%E5%95%8F%E9%A1%8C%E3%81%A8%E5%AF%BE%E5%BF%9C.pdf
• jvn.jphttps://jvn.jp/en/jp/JVN28045338/