CVE-2026-19234

Host code execution via boot-image stack overflow

Published Aug 19, 2026 · Updated Aug 21, 2026

Stack-based overflow in IBM Power Systems Firmware allows attackers with service-processor access to execute host code via a crafted update image. The host-firmware boot image-validation path accepts the image and overflows a stack buffer during validation. High-privilege service access is required; IBM has not further specified the resulting confidentiality, integrity, or availability effects.

CVSS severity8.2
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based overflow in IBM Power Systems Firmware allows attackers with service-processor access to execute host code via a crafted update image. The host-firmware boot image-validation path accepts the image and overflows a stack buffer during validation. High-privilege service access is required; IBM has not further specified the resulting confidentiality, integrity, or availability effects.

The record

CVE
CVE-2026-19234
Published
Aug 19, 2026
Updated
Aug 21, 2026
Vendor
IBM
Product
Power Systems Firmware
Classifications
CWE-121, T1601.002
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=FW1060.00 <=FW1060.80
  2. Affected versionversion=FW1110.00 <=FW1110.30
  3. Affected versionversion=FW1120.00

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

IBM · Power Systems Firmwareversion=FW1060.00 <=FW1060.80; version=FW1110.00 <=FW1110.30; version=FW1120.00

Published CVSS scores

8.2IBMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1601.002Modify System Image: Component Firmware

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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