CVE-2026-34980

7.5

HIGH CVSS 3.1

OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` code execution over the network

Overview

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.

Details

INFO

Published Date :

April 3, 2026, 10:16 p.m.

Last Modified :

July 24, 2026, 9:10 p.m.

Remotely Exploit :

No

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-34980 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Cups	cups
1	Openprinting	cups

: Total Affected Vendor : 2 | Products : 2

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS		134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1	HIGH	[email protected]
CVSS 4.0	MEDIUM	[email protected]

Solution

Ensure only authorized clients can send print jobs to shared queues.

Restrict access to shared queues.
Monitor print job submissions.
Apply vendor patches when available.

Public PoC/Exploit Available at Github

CVE-2026-34980 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-34980.

URL	Resource
https://github.com/OpenPrinting/cups/security/advisories/GHSA-4852-v58g-6cwf	Exploit Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-34980 is associated with the following CWEs:

CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-34980 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-23: File Content Injection File Content Injection CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies Accessing/Intercepting/Modifying HTTP Cookies CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-63: Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-73: User-Controlled Filename User-Controlled Filename CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-81: Web Server Logs Tampering Web Server Logs Tampering CAPEC-83: XPath Injection XPath Injection CAPEC-85: AJAX Footprinting AJAX Footprinting CAPEC-88: OS Command Injection OS Command Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-109: Object Relational Mapping Injection Object Relational Mapping Injection CAPEC-110: SQL Injection through SOAP Parameter Tampering SQL Injection through SOAP Parameter Tampering CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-136: LDAP Injection LDAP Injection CAPEC-153: Input Data Manipulation Input Data Manipulation CAPEC-182: Flash Injection Flash Injection CAPEC-209: XSS Using MIME Type Mismatch XSS Using MIME Type Mismatch CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-250: XML Injection XML Injection CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data Fuzzing for garnering other adjacent user/sensitive data CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-473: Signature Spoof Signature Spoof CAPEC-588: DOM-Based XSS DOM-Based XSS CAPEC-664: Server Side Request Forgery Server Side Request Forgery

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

ThureinOo/Security-Research

CVE writeups and vulnerability research

Updated: 3 weeks ago

0 stars 0 fork 0 watcher

Born at : July 7, 2026, 3:25 a.m. This repo has been linked 1 different CVEs too.

holmanholdings/lionguard

Cathedral-Grade Security for AI Agents. Attack vectors updated daily. Local-first, zero API cost. MIT licensed.

Python

Updated: 1 week ago

6 stars 0 fork 0 watcher

Born at : March 13, 2026, 5:10 p.m. This repo has been linked 119 different CVEs too.

ThureinOo/thureinoo

None

Updated: 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Aug. 10, 2023, 5:13 p.m. This repo has been linked 1 different CVEs too.

mrhenrike/PrinterXPL-Forge

Complete printer penetration testing toolkit with 109 commands across PJL, PostScript & PCL. 4 network protocols, automated discovery, file exfiltration, NVRAM access, attack payloads. Modern Python 3.8+ offensive security tool.

printer-security cybersecurity hacking-tools iot-hacking network-security pret printer-exploitation security-tools snmp-scanner pentest-iot printer-pentest

Python PostScript Shell Mermaid PowerShell Roff C Lua

Updated: 1 month ago

4 stars 1 fork 1 watcher

Born at : Aug. 22, 2022, 12:02 a.m. This repo has been linked 43 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-34980 vulnerability anywhere in the article.

CybersecurityNews

CUPS Vulnerability Chain Enables Remote Attacker to Execute Malicious Code as Root User

A critical vulnerability chain in the Common Unix Printing System (CUPS) that allows unauthenticated remote attackers to execute arbitrary malicious code with root system privileges. Security research ...

Published Date: Apr 08, 2026 (3 months, 2 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-34980 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

CVE Translated by [email protected]

Jul. 24, 2026

Action	Type	Old Value	New Value
Added	Translation		Title: cups de OpenPrinting, Description: OpenPrinting CUPS es un sistema de impresión de código abierto para Linux y otros sistemas operativos tipo Unix. En las versiones 2.4.16 y anteriores, en un cupsd expuesto a la red con una cola de destino compartida, un cliente no autorizado puede enviar un trabajo de impresión (Print-Job) a esa cola PostScript compartida sin autenticación. El servidor acepta un valor de page-border suministrado como textWithoutLanguage, conserva un salto de línea incrustado a través del escape de opciones y el reanálisis, y luego reanaliza el texto PPD: resultante de la segunda línea como un registro de control de programador de confianza. Un trabajo de impresión en bruto de seguimiento puede, por lo tanto, hacer que el servidor ejecute un binario existente elegido por el atacante, como /usr/bin/vim como lp. En el momento de la publicación, no hay parches disponibles públicamente.

CVE Modified by [email protected]

Jun. 17, 2026

Action	Type	Old Value	New Value
Added	Affected		[{'vendor': 'OpenPrinting', 'product': 'cups', 'versions': [{'status': 'affected', 'version': '<= 2.4.16'}]}]

CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Jun. 17, 2026

Action	Type	Old Value	New Value
Added	SSVC		{'id': 'CVE-2026-34980', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-06T13:12:31.098814Z'}

Initial Analysis by [email protected]

Apr. 16, 2026

Action	Type	New Value
Added	CVSS V3.1	AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CPE Configuration	OR cpe:2.3:a:openprinting:cups::::::::* versions up to (including) 2.4.16
Added	Reference Type	GitHub, Inc.: https://github.com/OpenPrinting/cups/security/advisories/GHSA-4852-v58g-6cwf Types: Exploit, Vendor Advisory

New CVE Received by [email protected]

Apr. 03, 2026

Action	Type	New Value
Added	Description	OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.
Added	CVSS V4.0	AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Added	CWE	CWE-20
Added	Reference	https://github.com/OpenPrinting/cups/security/advisories/GHSA-4852-v58g-6cwf

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.