CVE-2023-26066

Remote code execution via improper PostScript stack validation

Published Apr 10, 2023 · Updated Feb 11, 2025

A stack-validation flaw in Lexmark device firmware allows remote attackers to execute arbitrary code through a crafted PostScript job. A PostScript operator in the pagemark service fails to validate its operand stack, allowing user-supplied data to trigger a read past an allocated structure. Network-adjacent access is sufficient, authentication and user interaction are not required, and successful code runs in the admin context.

CVSS severity9.8
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack-validation flaw in Lexmark device firmware allows remote attackers to execute arbitrary code through a crafted PostScript job. A PostScript operator in the pagemark service fails to validate its operand stack, allowing user-supplied data to trigger a read past an allocated structure. Network-adjacent access is sufficient, authentication and user interaction are not required, and successful code runs in the admin context.

The record

CVE
CVE-2023-26066
Published
Apr 10, 2023
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-129, CAPEC-100
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.0LexmarkCVSS:3.1/AV:N/AC:H/PR:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CAPEC-100Overflow Buffers

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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