---
title: "CVE-2026-91255: Oracle Solaris - Denial of Service"
description: "Oracle Solaris 11.4 contains a denial of service vulnerability caused by a flaw in the Kernel, letting unauthenticated network attackers cause system hang or crash via HTTP, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-91255/
---

# CVE-2026-91255 Oracle Solaris - Denial of Service

Oracle Solaris 11.4 contains a denial of service vulnerability caused by a flaw in the Kernel, letting unauthenticated network attackers cause system hang or crash via HTTP, exploit requires network access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91255)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

20 October 2026

Updated

21 October 2026

## Vendor fix

Update to the latest version of Oracle Solaris.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91255](https://nvd.nist.gov/vuln/detail/CVE-2026-91255)
- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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