How to verify CVE-2026-39821

Confirm whether your systems are actually affected — run the exact detection check below (Nuclei command or OpenVAS NVT). Detection only; it does not exploit.

Verify with OpenVAS

Greenbone/OpenVAS ships 61 NVT checks for CVE-2026-39821. OpenVAS detects this CVE by NVT OID — enable the NVT in your scan config, or confirm it is in your feed with the query below.

Confirm the NVT is in your feed (GMP)

gvm-cli socket --xml "<get_nvts nvt_oid='1.3.6.1.4.1.25623.1.1.11.2026.30853' details='1'/>"

NVT OIDs (61)

1.3.6.1.4.1.25623.1.1.11.2026.30853since 2026-07-01
1.3.6.1.4.1.25623.1.1.11.2026.30854since 2026-07-01
1.3.6.1.4.1.25623.1.1.11.2026.30855since 2026-07-01
1.3.6.1.4.1.25623.1.1.12.2026.8416.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.15.2026.30853since 2026-07-01
1.3.6.1.4.1.25623.1.1.18.1.2026.10856.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2026.10871.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2026.10872.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2026.10873.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2026.10875.1since 2026-06-25

+ 51 more NVTs

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