CVE-2026-28356

Estado: AplazadaAlta (7.5)—
multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or multipart segment headers. This can be abused for denial of service (DoS) attacks against web applications using this library to parse request headers or multipart/form-data streams. The issue is fixed in 1.2.2, 1.3.1 and 1.4.0-dev.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.03%
Percentil entre todas las CVEs puntuadas: 62
Fecha de la puntuación: 5/10/2026
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.
ExplotaciónT1190 Exploit Public-Facing Applicationinitial access92 %
Impacto principalT1499.004 Application or System Exploitationimpact88 %
ReDoS en regex de parse_options_header() alcanzable remotamente sin autenticación (AV:N,PR:N) contra aplicaciones web usando la librería; impacto explícito de DoS mediante consumo de CPU.
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 Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application 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.
Konghq — Multipart^AI
CWE

CWE-1333
CWE-1333
Referencias

JSON original (NVD)

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  "published": "2026-03-12T17:16:50.080",
  "references": [
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      "url": "https://github.com/defnull/multipart/security/advisories/GHSA-p2m9-wcp5-6qw3",
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  "vulnStatus": "Deferred",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-1333"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
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          "lang": "en",
          "value": "CWE-1333"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or multipart segment headers. This can be abused for denial of service (DoS) attacks against web applications using this library to parse request headers or multipart/form-data streams. The issue is fixed in 1.2.2, 1.3.1 and 1.4.0-dev."
    },
    {
      "lang": "es",
      "value": "multipart es un rápido analizador de multipart/form-data para Python. Antes de 1.2.2, 1.3.1 y 1.4.0-dev, la función parse_options_header() en multipart.py utiliza una expresión regular con una alternancia ambigua, lo que puede causar retroceso exponencial (ReDoS) al analizar encabezados HTTP o de segmento multipart maliciosamente elaborados. Esto puede ser abusado para ataques de denegación de servicio (DoS) contra aplicaciones web que utilizan esta biblioteca para analizar encabezados de solicitud o flujos de multipart/form-data. El problema está solucionado en 1.2.2, 1.3.1 y 1.4.0-dev."
    }
  ],
  "lastModified": "2026-08-24T13:17:53.460",
  "sourceIdentifier": "security-advisories@github.com"
}