CVE-2026-18511

IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension

Published Aug 13, 2026 CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

IBM

affected

Version	Status	Constraints
`7.6`	affected	—
`7.5`	affected	—
`7.4`	affected	—
`7.3`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:ibm:i:7.3:::::::*
	cpe:2.3:a:ibm:i:7.4:::::::*
	cpe:2.3:a:ibm:i:7.5:::::::*
	cpe:2.3:a:ibm:i:7.6:::::::*

No data.

Vendor Product Versions

Ibm

Version	Status	Scheme	Platform
`7.6`	affected	generic	—
`7.5`	affected	generic	—
`7.4`	affected	generic	—
`7.3`	affected	generic	—

Remediation

Vendor Solution

IBM strongly recommends addressing the vulnerability now. IBM i Release5770-JV1 PTF Number(s)PTF Download Link(s)7.6SJ11036 SJ11072 SJ11082 SJ11088 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088 7.5SJ11068 SJ11073 SJ11070 SJ11077 SJ11087 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087 7.4SJ11071 SJ11069 SJ11076 SJ11086 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086 7.3SJ11067 SJ11075 SJ11085 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085 IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.296% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://www.ibm.com/support/pages/node/7283285

History

Aug 14, 2026 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 13, 2026 9:00 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension
First Time appeared		Ibm Ibm i
Weaknesses		CWE-787
CPEs		cpe:2.3:a:ibm:i:7.3.0:::::::* cpe:2.3:a:ibm:i:7.3:::::::* cpe:2.3:a:ibm:i:7.4.0:::::::* cpe:2.3:a:ibm:i:7.4:::::::* cpe:2.3:a:ibm:i:7.5.0:::::::* cpe:2.3:a:ibm:i:7.5:::::::* cpe:2.3:a:ibm:i:7.6.0:::::::* cpe:2.3:a:ibm:i:7.6:::::::*
Vendors & Products		Ibm Ibm i
References		https://www.ibm.com/support/pages/node/7283285
Metrics		cvssV3_1 `{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}`