# CVE-2026-34990: OpenPrinting CUPS: Local print admin token disclosure using temporary printers > Local attackers can steal admin tokens to create malicious print queues, enabling arbitrary root file overwrites and command execution. - **Severity:** Medium 5.0 (`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`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 3 Apr 2026 - **Updated:** 6 Apr 2026 - **Also known as:** ALPINE-CVE-2026-34990, AZL-81825, BELL-CVE-2026-34990, CLSA-2026-1786675343, DEBIAN-CVE-2026-34990, ECHO-f586-616e-6b78, GHSA-c54j-2vqw-wpwp, ROOT-OS-DEBIAN-12-CVE-2026-34990, ROOT-OS-DEBIAN-13-CVE-2026-34990, SUSE-SU-2026:1399-1, UBUNTU-CVE-2026-34990 ## What is CVE-2026-34990? CVE-2026-34990 is a medium-severity vulnerability in OpenPrinting cups, published on 3 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim. ### Official 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. Weakness: CWE-287 (Improper Authentication) ## Which versions are affected by CVE-2026-34990? It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `cups` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Micro 5.2 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Micro 5.3 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Micro 5.4 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Micro 5.5 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Module for Development Tools 15 SP7 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 2.2.7-150000.3.86.1 | | `cups` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 2.2.7-150000.3.86.1 | Products: Openprinting Cups. ## How do I fix CVE-2026-34990? No fix published yet. ## Is CVE-2026-34990 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34990 exists. Public exploit code: - CVE-2026-34990 minimal PoC. CUPS <= 2.4.16 local privesc. (github_poc): https://github.com/predyy/CVE-2026-34990 - https://github.com/0xc4rc3l/CVE-2026-34990-poc (github_poc): https://github.com/0xc4rc3l/CVE-2026-34990-poc - LPE PoC for CVE-2026-34990 using a CUPS root file write vulnerability. (github_poc): https://github.com/DENNISDGR/CVE-2026-34990-poc - https://github.com/khush-613/CVE-2026-34990-poc (github_poc): https://github.com/khush-613/CVE-2026-34990-poc - Generic PoC for CVE-2026-34990 - CUPS 2.4.16 Local Privilege Escalation via Local token disclosure and arbitrary root file overwrite. (github_poc): https://github.com/Noorkhalel/CVE-2026-34990-CUPS-LPE-PoC - CVE-2026-34990 - OpenPrinting CUPS 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. (github_poc): https://github.com/ungabunga-ctf/CVE-2026-34990 ## Other vulnerabilities in OpenPrinting cups - [CVE-2025-58060](https://insights.sbomify.com/CVE-2025-58060/): cups has Authentication bypass with AuthType Negotiate (high 8.0) - [CVE-2026-34978](https://insights.sbomify.com/CVE-2026-34978/): Path traversal in cups (medium 6.5) - [CVE-2025-58364](https://insights.sbomify.com/CVE-2025-58364/): cups: Remote DoS via null dereference (medium 6.5) - [CVE-2026-34980](https://insights.sbomify.com/CVE-2026-34980/): OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` code execution over the network (medium 6.1) - [CVE-2025-61915](https://insights.sbomify.com/CVE-2025-61915/): OpenPrinting CUPS vulnerable to stack based out-of-bound write (medium 6.0) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-34990 and fix it if it is affected. What it is: CVE-2026-34990 is a medium-severity vulnerability in OpenPrinting cups, published on 3 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34990 exists. Affected product: OpenPrinting cups. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-34990/ (Markdown: https://insights.sbomify.com/CVE-2026-34990/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34990 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34990 - OSV: https://osv.dev/vulnerability/CVE-2026-34990 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-34990/ Summaries are generated and may contain mistakes; the official description above is the record.