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CVE-2026-34990

Estado: AnalizadaMedia (5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Openprinting — Cups

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-34990",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-34990",
          "role": "CISA Coordinator",
          "options": [
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          "version": "2.0.3",
          "timestamp": "2026-04-06T18:51:42.773546Z"
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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    "cvssMetricV40": [
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        "cvssData": {
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          "Automatable": "NOT_DEFINED",
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          "valueDensity": "NOT_DEFINED",
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  "published": "2026-04-03T22:16:27.400",
  "references": [
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  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-287"
        }
      ]
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  ],
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      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "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, un usuario local sin privilegios puede forzar a cupsd a autenticarse en un servicio IPP de localhost controlado por el atacante con un token de Autorización: Local ... reutilizable. Ese token es suficiente para impulsar solicitudes /admin/ en localhost, y el atacante puede combinar CUPS-Create-Local-Printer con printer-is-shared=true para persistir una cola file:///... aunque la política normal de FileDevice rechaza tales URIs. Imprimir en esa cola permite una sobrescritura arbitraria de archivos de root; el PoC a continuación utiliza esa primitiva para soltar un fragmento de sudoers y demostrar la ejecución de comandos como root. En el momento de la publicación, no hay parches disponibles públicamente."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
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