CVE-2026-18020: CWE-125 Out-of-bounds Read
CVE-2026-18020 is an out-of-bounds read vulnerability (CWE-125) affecting IBM i versions 7.3, 7.4, 7.5, and 7.6. It involves an off-by-one error in bounds checking that could allow a remote attacker to cause a denial of service. The vulnerability does not impact confidentiality or integrity but can disrupt availability. The CVSS score is 5.3, indicating a medium severity level. No official patch or remediation guidance is currently available, and no known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability in IBM i 7.3 through 7.6 arises from an off-by-one error in bounds checking, leading to an out-of-bounds read condition (CWE-125). A remote attacker could exploit this flaw to cause a denial of service by triggering the erroneous bounds check. The vulnerability affects availability only and does not compromise confidentiality or integrity. No vendor advisory or patch information is currently provided, and no active exploitation has been observed.
Potential Impact
The impact is limited to denial of service, potentially causing system disruption on affected IBM i versions. There is no impact on data confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, monitor IBM's security advisories for updates. No specific mitigation steps are provided by the vendor at this time.
CVE-2026-18020: CWE-125 Out-of-bounds Read
Description
CVE-2026-18020 is an out-of-bounds read vulnerability (CWE-125) affecting IBM i versions 7.3, 7.4, 7.5, and 7.6. It involves an off-by-one error in bounds checking that could allow a remote attacker to cause a denial of service. The vulnerability does not impact confidentiality or integrity but can disrupt availability. The CVSS score is 5.3, indicating a medium severity level. No official patch or remediation guidance is currently available, and no known exploits are reported in the wild.
CVSS v3.1
Score 5.3medium
Affected software
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 in IBM i 7.3 through 7.6 arises from an off-by-one error in bounds checking, leading to an out-of-bounds read condition (CWE-125). A remote attacker could exploit this flaw to cause a denial of service by triggering the erroneous bounds check. The vulnerability affects availability only and does not compromise confidentiality or integrity. No vendor advisory or patch information is currently provided, and no active exploitation has been observed.
Potential Impact
The impact is limited to denial of service, potentially causing system disruption on affected IBM i versions. There is no impact on data confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, monitor IBM's security advisories for updates. No specific mitigation steps are provided by the vendor at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-27T23:56:18.399Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7e2fb1bf8831d539cb5ca6
Added to database: 08/13/2026, 20:57:21 UTC
Last enriched: 08/13/2026, 21:12:23 UTC
Last updated: 08/14/2026, 00:32:44 UTC
Views: 4
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.