What is CVE-2026-9155?

CVE-2026-9155 is a high-severity vulnerability in Gnu Sed, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-06-25.

How severe is CVE-2026-9155?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Gnu Sed

CVE-2026-9155

OS Command Injection vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to execute arbitrary OS commands via the expression parameter due to insufficient input validation.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.009 (56.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Gnu Sed — versions 4.2.2
Linux Linux_kernel
Rapid7 Insightconnect Sed Plugin — versions 0, 2.0.5

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

cve@rapid7.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9155?: CVE-2026-9155 is a high-severity vulnerability in Gnu Sed, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-06-25.
How severe is CVE-2026-9155?: High severity. CVSS v3 base score is 8.8 out of 10.