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CVE-2026-15709

Estado: AplazadaAlta (7.5)—

A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension. The extension's decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections.

Leer descripción completaMostrar menos

A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N/PR:N/UI:N indica red sin autenticación (T1190). La descripción detalla envío de payload comprimido causando OOM/DoS (T1499.004: defensa de aplicación), sin interacción requerida.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Libsoup — LibsoupAI

CWE

Referencias

JSON original (NVD)

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  "published": "2026-07-14T20:16:57.027",
  "references": [
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:68234",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:68235",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:68612",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:69108",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:69297",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:69863",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:70598",
      "source": "secalert@redhat.com"
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      "url": "https://access.redhat.com/errata/RHSA-2026:70599",
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      "url": "https://access.redhat.com/errata/RHSA-2026:71389",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-15709",
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    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499922",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511",
      "source": "secalert@redhat.com"
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      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/511",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension. The extension's decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS)."
    }
  ],
  "lastModified": "2026-09-24T10:17:34.317",
  "sourceIdentifier": "secalert@redhat.com"
}