How severe is CVE-2026-9155?

CVE-2026-9155 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-9155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9155?

CVE-2026-9155 affects Gnu Sed. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9155?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-9155 have an EU (EUVD) identifier?

Yes. CVE-2026-9155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39153.

When was CVE-2026-9155 published?

CVE-2026-9155 was published on 2026-06-25 and last updated on 2026-06-27.

CVE-2026-9155

CVE-2026-9155 is a high-severity vulnerability in Gnu Sed with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39153
Weakness: CWE-78
Affected product: Gnu Sed
Published: 2026-06-25
Last modified: 2026-06-27

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-9155?: CVE-2026-9155 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-9155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9155?: CVE-2026-9155 affects Gnu Sed. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9155?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-9155 have an EU (EUVD) identifier?: Yes. CVE-2026-9155 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39153.
When was CVE-2026-9155 published?: CVE-2026-9155 was published on 2026-06-25 and last updated on 2026-06-27.

References

https://extensions.rapid7.com/extension/sed

Affected products (1)

cpe:2.3:a:gnu:sed:4.2.2:*:*:*:*:*:*:*

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