CVE-2026-55467Public exploitHinoki check available

Queue disruption via unsanitized fax options

Published Oct 15, 2026 · Updated Oct 15, 2026

Option injection in OpenPrinting CUPS 2.4.19 and earlier allows local users to disrupt fax queues via crafted job attributes. The option builder in scheduler/job.c copies destination-uri and pre-dial-string into phone and faxPrefix without removing control characters before passing them to filters. Exploitation requires job-submission permission and a configured fax queue; the maintainer limits the impact to possible queue disablement, with code execution dependent on a separate optional filter.

CVSS severity2.5
Low
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Option injection in OpenPrinting CUPS 2.4.19 and earlier allows local users to disrupt fax queues via crafted job attributes. The option builder in scheduler/job.c copies destination-uri and pre-dial-string into phone and faxPrefix without removing control characters before passing them to filters. Exploitation requires job-submission permission and a configured fax queue; the maintainer limits the impact to possible queue disablement, with code execution dependent on a separate optional filter.

The record

CVE
CVE-2026-55467
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
OpenPrinting
Product
CUPS
Classifications
CWE-150, CWE-94, CWE-93
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=< 2.4.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenPrinting · CUPSversion=< 2.4.20

Published CVSS scores

6.3SUSECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
2.3SUSECVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
2.5OpenPrintingCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
7.5OpenPrinting advisory reporterCVSS:3.1/AV:N/AC:H/PR:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-150Improper Neutralization of Escape, Meta, or Control Sequences
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')

Public exploit references

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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