CVE-2026-39314

{
  "id": "CVE-2026-39314",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-07T17:16:37.073",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "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, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service."
    },
    {
      "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, una vulnerabilidad de desbordamiento negativo de enteros en _ppdCreateFromIPP() (cups/ppd-cache.c) permite a cualquier usuario local sin privilegios bloquear el proceso raíz de cupsd al proporcionar un atributo IPP ’job-password-supported’ negativo. La comprobación de límites solo limita el límite superior, por lo que un valor negativo pasa la validación, se convierte a size_t (ajustándose a ~2^64) y se utiliza como argumento de longitud para memset() en un búfer de pila de 33 bytes. Esto causa un SIGSEGV inmediato en el proceso raíz de cupsd. Combinado con ’Restart=on-failure’ de systemd, un atacante puede repetir el bloqueo para una denegación de servicio sostenida."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "OpenPrinting",
          "product": "cups",
          "versions": [
            {
              "version": "<= 2.4.16",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 4.0,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 1.4
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 6.2,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-07T18:34:10.694006Z",
          "id": "CVE-2026-39314",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*",
              "versionEndIncluding": "2.4.16",
              "matchCriteriaId": "8A2A4507-B2D7-43B8-B008-6EC2F5053FA9"
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  "references": [
    {
      "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-pp8w-2g52-7vj7",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}