CVE-2026-17083Network attack vector

Unauthenticated code execution via stack buffer overflow

Published Aug 12, 2026 · Updated Aug 12, 2026

Stack-based buffer overflow in IBM’s Power operating system 7.3 through 7.6 allows remote attackers to execute arbitrary code. IBM has not disclosed the affected Debug Server parser, request field, or copy operation that writes beyond the stack buffer. No authentication or user interaction is required; successful exploitation executes code in the Debug Server process context.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IBM’s Power operating system 7.3 through 7.6 allows remote attackers to execute arbitrary code. IBM has not disclosed the affected Debug Server parser, request field, or copy operation that writes beyond the stack buffer. No authentication or user interaction is required; successful exploitation executes code in the Debug Server process context.

The record

CVE
CVE-2026-17083
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
IBM
Product
IBM i
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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 privilegesunauthenticated

What is affected?

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

Published CVSS scores

9.8IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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