CVE-2026-18086: CWE-787 Out-of-bounds Write
CVE-2026-18086 is a medium severity vulnerability in IBM i versions 7.3 through 7.6. It involves an out-of-bounds write due to improper bounds checking, which could allow a local attacker to execute arbitrary code or cause a denial of service.
AI Analysis
Technical Summary
This vulnerability (CWE-787) affects IBM i operating system versions 7.3, 7.4, 7.5, and 7.6. It arises from improper bounds checking that can lead to an out-of-bounds write. Exploitation requires local access with low privileges and high attack complexity. Successful exploitation could result in limited confidentiality, integrity, and availability impacts, including arbitrary code execution or denial of service.
Potential Impact
An attacker with local access and low privileges could exploit this vulnerability to execute arbitrary code or cause a denial of service on affected IBM i systems. The impact on confidentiality, integrity, and availability is limited but present.
Mitigation Recommendations
No official patch or remediation level has been published yet. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Due to the high attack complexity and requirement for local access, risk can be partially mitigated by restricting local user access and monitoring for suspicious activity.
CVE-2026-18086: CWE-787 Out-of-bounds Write
Description
CVE-2026-18086 is a medium severity vulnerability in IBM i versions 7.3 through 7.6. It involves an out-of-bounds write due to improper bounds checking, which could allow a local attacker to execute arbitrary code or cause a denial of service.
CVSS v3.1
Score 4.5medium
Affected software
IBM
cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-787) affects IBM i operating system versions 7.3, 7.4, 7.5, and 7.6. It arises from improper bounds checking that can lead to an out-of-bounds write. Exploitation requires local access with low privileges and high attack complexity. Successful exploitation could result in limited confidentiality, integrity, and availability impacts, including arbitrary code execution or denial of service.
Potential Impact
An attacker with local access and low privileges could exploit this vulnerability to execute arbitrary code or cause a denial of service on affected IBM i systems. The impact on confidentiality, integrity, and availability is limited but present.
Mitigation Recommendations
No official patch or remediation level has been published yet. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Due to the high attack complexity and requirement for local access, risk can be partially mitigated by restricting local user access and monitoring for suspicious activity.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-28T15:56:38.935Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a7e2fb3bf8831d539cb5cc9
Added to database: 08/13/2026, 20:57:23 UTC
Last enriched: 08/21/2026, 14:04:50 UTC
Last updated: 09/28/2026, 13:47:42 UTC
Views: 51
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.