How to verify CVE-2026-55991

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 8 NVT checks for CVE-2026-55991. 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='1.3.6.1.4.1.25623.1.0.133438' details='1'/>"

NVT OIDs (8)

1.3.6.1.4.1.25623.1.0.133438since 2026-08-05
1.3.6.1.4.1.25623.1.1.10.2026.0316since 2026-08-05
1.3.6.1.4.1.25623.1.1.18.1.2026.11380.1since 2026-07-29
1.3.6.1.4.1.25623.1.1.18.1.2026.21550.1since 2026-08-14
1.3.6.1.4.1.25623.1.1.4.2026.23215.1since 2026-08-29
1.3.6.1.4.1.25623.1.1.4.2026.23226.1since 2026-08-29
1.3.6.1.4.1.25623.1.1.9.2026.1014959810059101102since 2026-07-31
1.3.6.1.4.1.25623.1.1.9.2026.3170101101697199since 2026-08-01

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