CVE-2026-18102Network attack vector

Adjacent-memory overwrite via integer-underflowed bounds check

Published Aug 19, 2026 · Updated Aug 20, 2026

Heap-based buffer overflow in IBM's integrated platform versions 7.3 through 7.6 allows remote authenticated users to overwrite adjacent memory. An integer underflow in an undisclosed bounds-checking locus causes the check to accept a size that permits writes beyond the intended heap buffer. A low-privileged account and a high-complexity trigger are required; IBM reports limited memory integrity impact and no confidentiality or availability impact.

CVSS severity3.5
Low
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in IBM's integrated platform versions 7.3 through 7.6 allows remote authenticated users to overwrite adjacent memory. An integer underflow in an undisclosed bounds-checking locus causes the check to accept a size that permits writes beyond the intended heap buffer. A low-privileged account and a high-complexity trigger are required; IBM reports limited memory integrity impact and no confidentiality or availability impact.

The record

CVE
CVE-2026-18102
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
IBM
Product
IBM i
Classifications
CWE-122
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.3
  2. Affected versionversion=7.4
  3. Affected versionversion=7.5
  4. Affected versionversion=7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM iversion=7.3; version=7.4; version=7.5; version=7.6

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.5IBMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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