Heap-based buffer overflow in Oracle WebLogic Server Proxy Plug-In - CVE-2026-21962
Published: January 20, 2026 / Updated: April 1, 2026
Vulnerability identifier: #VU121716
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21962
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Oracle WebLogic Server Proxy Plug-in when handling HTTP requests. A remote attacker can send specially crafted HTTP requests to the server, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Oracle WebLogic Server Proxy Plug-In
Oracle HTTP Server
Oracle HTTP Server
How to mitigate CVE-2026-21962
Install updates from vendor's website.
Links to Public Exploits and PoC-codes
- Exploit #12534 - CVE-2026-21962_Java_GUI_Exploit_Tool () (April 1, 2026)
- Exploit #12399 - CVE-2026-21962-Oracle-HTTP-Server-WebLogic-Proxy-Plug-in-Critical- (Oracle Fusion Middleware Oracle HTTP Server / WebLogic Server Proxy Plug-in has an easily exploitable, unauthenticated, network-reachable flaw allowing compromise over HTTP. Affected supp (February 13, 2026)