Oracle Solaris: Denial of service and information disclosure in Services component
Summary
A flaw in the Services component of Oracle Solaris 11.4 can be triggered over the network via HTTP without authentication. An attacker can cause a hang or repeatable crash of the system and read a subset of accessible data. The CVSS vector indicates high availability impact and low confidentiality impact, with no integrity impact.
Affected
- Oracle Solaris 11.4 (Services component)
Fixed in
- Unknown. The fix is likely part of the October 2026 Critical Patch Update; the exact Solaris 11.4 SRU and patch ID must be confirmed in the Oracle advisory or My Oracle Support.
Workaround
- No vendor-published workaround known.
- Restrict network access to HTTP-facing Solaris services to trusted sources using firewall rules or network segmentation (general hardening, not a vendor statement).
Exploitation
- Not listed in CISA KEV.
- No known exploitation in the wild.
- No public proof of concept found.
- EPSS score reported as 0.00408 (low).
- CISA SSVC: automatable yes, technical impact partial.
Our recommendation
- Check whether any Solaris 11.4 host is reachable from the internet or untrusted networks; prioritise these hosts.
- Confirm the fixed SRU and patch ID in the October 2026 CPU advisory (check the current revision) and apply it via the SRU and pkg update.
- Until patched, limit HTTP access to trusted sources.
- Monitor for unusual HTTP traffic and service crashes on Solaris hosts.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Critical Patch Update October 2026 www.oracle.com
- NVD/OpenCVE record CVE-2026-91252 app.opencve.io
- Vulners CVE-2026-91252 vulners.com
- Brandefense: Oracle October 2026 CPU brandefense.io
- BreachRoad: October 2026 CPU fixes breachroad.com
- Oracle Solaris 11.4 SRU91 announcement blogs.oracle.com
- Oracle Solaris (Wikipedia) en.wikipedia.org
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 15:27.
Original description (NVD)
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Services). The supported version that is affected is 11.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Solaris. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Solaris and unauthorized read access to a subset of Oracle Solaris accessible data. CVSS 3.1 Base Score 8.2 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H).
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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