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CVE-2026-34990— OpenPrinting CUPS: Local print admin token disclosure using temporary printers

Quick assessment

Affected
OpenPrinting cups
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenPrinting CUPS是OpenPrinting公司的一个适用于 Linux® 和其他类 Unix® 操作系统的基于标准的开源打印系统。 OpenPrinting CUPS 2.4.16及之前版本存在安全漏洞，该漏洞源于本地非特权用户可以强制cupsd使用可重用的授权令牌向攻击者控制的本地IPP服务进行身份验证，可能导致任意root文件覆盖和root命令执行。

AI Predicted 8.8 Difficulty: Easy EPSS 0.18% · P7
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I. Basic Information for CVE-2026-34990

Vulnerability Information
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Vulnerability Title
OpenPrinting CUPS: Local print admin token disclosure using temporary printers
Source: CVE Program / CVE List V5
Vulnerability Description
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenPrinting CUPS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenPrinting CUPS是OpenPrinting公司的一个适用于 Linux® 和其他类 Unix® 操作系统的基于标准的开源打印系统。 OpenPrinting CUPS 2.4.16及之前版本存在安全漏洞，该漏洞源于本地非特权用户可以强制cupsd使用可重用的授权令牌向攻击者控制的本地IPP服务进行身份验证，可能导致任意root文件覆盖和root命令执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenPrinting cups <= 2.4.16 -

II. Public POCs for CVE-2026-34990

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III. Intelligence Information for CVE-2026-34990

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Vendor Advisories for CVE-2026-34990 (1)

Same Patch Batch · OpenPrinting · 2026-04-03 · 5 CVEs total

CVE-2026-34978 6.5 MEDIUM OpenPrinting CUPS: Path traversal in RSS notify-recipient-uri enables file write outside C
CVE-2026-34979 5.3 MEDIUM OpenPrinting CUPS: Heap overflow in `get_options()`
CVE-2026-27447 4.8 MEDIUM OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup
CVE-2026-34980 OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` co

IV. Related Vulnerabilities

Same product: cups
Same vendor: OpenPrinting
Same weakness: CWE-287

V. Comments for CVE-2026-34990

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