Summary

Oracle’s October 2026 Critical Patch Update delivers 1,295 security patches addressing 1,209 unique CVEs, as some flaws affect multiple products, and 112 of these patches are rated critical. Fusion Middleware received the most fixes with 206, followed by E-Business Suite with 194, Database Products with 126, and Siebel CRM with 122, among other product families. The most serious flaw, CVE-2026-101767, is an unauthenticated SQL injection in Oracle E-Business Suite that can lead to full takeover of affected instances. Critical flaws in bundled components, including CVE-2025-15467 in OpenSSL, CVE-2026-42779 in Apache MINA, and CVE-2026-59083 in Apache Tomcat, are also remotely exploitable without authentication. None of these vulnerabilities has been reported as exploited in the wild, but the critical ratings, low attack complexity, and public exploit material make prompt patching across all affected Oracle product families essential.

CVEs

Vulnerability Details

Affected products and CPE

Recommendations

1. 01
   Apply Oracle's October 2026 Critical Patch Update

   Install the October 2026 Critical Patch Update on every affected Oracle product family without delay, including Oracle E-Business Suite, WebLogic Server, MySQL, JD Edwards EnterpriseOne Tools, PeopleSoft Enterprise PeopleTools, Siebel CRM, Enterprise Manager, Managed File Transfer, and GoldenGate Stream Analytics. Use the Patch Availability Document for each product family, and My Oracle Support Note KA923 for E-Business Suite, to identify the correct fixes for each environment.
2. 02
   Prioritize by Severity and Exposure

   Patch internet-facing systems first, starting with the flaws Oracle rates as critical and remotely exploitable without authentication: CVE-2026-101767 in E-Business Suite, CVE-2025-15467 in JD Edwards and MySQL, CVE-2026-42779 in Managed File Transfer and healthcare products, and CVE-2026-59083 in Siebel CRM. Address the high severity code execution flaws next, followed by the remaining medium severity issues.
3. 03
   Rely on Oracle-Supplied Patches for Bundled Components

   Many of these flaws sit in third-party libraries such as OpenSSL, Apache Tomcat, Apache MINA, jackson-databind, and libssh2 that ship inside Oracle products. Apply Oracle’s patches rather than manually replacing these libraries, which can break supportability. Use Oracle’s exploitability notes to judge which bundled components are actually exposed in each product.
4. 04
   Enforce Least Privilege and Monitor for Exploitation

   Minimize the operating system privileges of accounts that run Oracle applications so that a successful compromise yields the smallest possible foothold. Monitor web tier logs and hosts for anomalous requests and unexpected shell processes spawned by Oracle services, including unauthenticated POST requests to /OA_HTML/AppsTCFServer on E-Business Suite.
5. 05
   Apply Oracle's Interim Workarounds

   Until patches are applied, reduce the risk of successful attack by blocking the network protocols an attack requires and by removing privileges or package access from users who do not need them. Test these changes on non-production systems first, as they may break application functionality, and treat them only as a temporary measure until patching is complete.

Indicators of Compromise (IoCs)

MITRE ATT&CK TTPs

References & Patch Links

Patch links

• https://www.oracle.com/security-alerts/cpuoct2026.html
• https://support.oracle.com/support/?documentId=KA923

References

• https://www.oracle.com/security-alerts/cpuoct2026.html
• https://horizon3.ai/attack-research/vulnerabilities/cve-2026-101767/