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CVE-2026-18511— IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension

Quick assessment

Affected
IBM i
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM i是美国IBM公司的一款操作系统。 IBM i 7.6版本、7.5版本、7.4版本和7.3版本存在缓冲区错误漏洞，该漏洞源于TLS会话建立期间边界检查不当，导致Native IBM i JSSE provider中的栈缓冲区溢出，本地攻击者可能溢出固定长度缓冲区并执行任意代码或导致JVM进程崩溃。

CVSS 7.3 · High EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 4

VendorProduct Version RangeStatus
IBM i 7.6 affected
7.5 affected
7.4 affected
7.3 affected
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I. Basic Information for CVE-2026-18511

Vulnerability Information
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Vulnerability Title
IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension
Source: CVE Program / CVE List V5
Vulnerability Description
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
IBM i 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM i是美国IBM公司的一款操作系统。 IBM i 7.6版本、7.5版本、7.4版本和7.3版本存在缓冲区错误漏洞，该漏洞源于TLS会话建立期间边界检查不当，导致Native IBM i JSSE provider中的栈缓冲区溢出，本地攻击者可能溢出固定长度缓冲区并执行任意代码或导致JVM进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM i 7.6 cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18511

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III. Intelligence Information for CVE-2026-18511

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Vendor Advisories for CVE-2026-18511 (1)

Same Patch Batch · IBM · 2026-08-13 · 74 CVEs total

CVE-2026-17482 9.8 CRITICAL IBM Documentation Offline is vulnerable to information disclosure, session forgery and rem
CVE-2026-14525 9.4 CRITICAL IBM WebSphere Application Server Liberty is affected by an authenication bypass
CVE-2026-19297 9.1 CRITICAL Insufficient Authentication Brute Force Protection on Login Endpoint
CVE-2026-18193 8.9 HIGH IBM i Is Affected By Multiple Vulnerabilities in IBM Java SDK and IBM Java Runtime
CVE-2026-17481 8.8 HIGH IBM Documentation Offline is vulnerable to information disclosure, session forgery and rem
CVE-2026-17029 8.8 HIGH IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension
CVE-2026-16674 8.8 HIGH IBM i is Affected By Multiple Vulnerabilities in WebSphere Application Server Liberty
CVE-2026-16987 8.8 HIGH IBM i is Affected By An Improper Validation Vulnerability in PASE []
CVE-2026-16722 8.8 HIGH IBM i is Affected By An Unauthorized Privileges Vulnerability in SQL []
CVE-2026-16975 8.8 HIGH IBM i is Affected By A Remote Code Execution Vulnerability []
CVE-2026-17223 8.8 HIGH IBM i is Affected By Multiple Vulnerabilities in Host Servers
CVE-2026-18101 8.8 HIGH IBM i is Affected By Multiple Vulnerabilities in WebSphere Application Server Liberty
CVE-2026-16815 8.6 HIGH IBM i is Affected By Multiple Vulnerabilities in Simple Mail Transfer Protocol
CVE-2026-17502 8.6 HIGH IBM i is Affected By Multiple Vulnerabilities in NetServer
CVE-2026-16967 8.5 HIGH IBM i is Affected By Multiple SQL Vulnerabilities [, ]
CVE-2026-16908 8.5 HIGH IBM i is Affected By Multiple SQL Vulnerabilities [, ]
CVE-2026-18249 8.4 HIGH IBM i Is Affected By Multiple Vulnerabilities in IBM Java SDK and IBM Java Runtime
CVE-2026-17101 8.3 HIGH IBM i is Affected By Multiple Vulnerabilities in Navigator for i
CVE-2026-17220 8.2 HIGH IBM i is Affected By Multiple Vulnerabilities in Host Servers
CVE-2026-18509 8.2 HIGH IBM i is Affected By A Prvilege Escalation Vulnerability []

Showing top 20 of 74 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: i
Same vendor: IBM
Same weakness: CWE-787

V. Comments for CVE-2026-18511

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