CVE-2026-17040Network attack vector

Unauthenticated code execution via undisclosed buffer overflow

Published Aug 20, 2026 · Updated Aug 25, 2026

Buffer overflow in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows remote attackers to execute arbitrary code over a network. IBM has not published the affected component, protocol, input field, or copy operation that mishandles untrusted data. No authentication or user interaction is required; successful exploitation runs attacker-controlled code in the affected system context.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows remote attackers to execute arbitrary code over a network. IBM has not published the affected component, protocol, input field, or copy operation that mishandles untrusted data. No authentication or user interaction is required; successful exploitation runs attacker-controlled code in the affected system context.

The record

CVE
CVE-2026-17040
Published
Aug 20, 2026
Updated
Aug 25, 2026
Vendor
IBM
Product
AIX
Classifications
CWE-120, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=7.2
  2. Affected versionversion=7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · AIXversion=7.2; version=7.3
IBM · PowerVM Virtual I/O Serverversion=4.1

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

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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