CVE-2026-48594

Estado: ModificadaAlta (8.2)—

Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in elixir-tesla tesla allows a denial of service via decompression bomb in HTTP response bodies.

When Tesla.Middleware.DecompressResponse or Tesla.Middleware.Compression is included in a Tesla middleware pipeline, HTTP response bodies are decompressed eagerly with no size limit. The decompress_body/2 function in lib/tesla/middleware/compression.ex passes the entire response body to :zlib.gunzip/1 or :zlib.unzip/1 without any cap on the output size.

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Additionally, compression_algorithms/1 splits the content-encoding header on commas and decompress_body/2 recurses once per token, applying a decompression pass on each iteration. A server advertising content-encoding: gzip, gzip, gzip, gzip causes four recursive decompression passes, yielding exponential amplification: each gzip layer can expand its input roughly 1000x, so a payload of a few hundred bytes on the wire inflates to gigabytes of BEAM heap, exhausting memory and crashing or freezing the calling process.

This issue affects tesla: from 0.6.0 before 1.18.3.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.2

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.70%
Percentil entre todas las CVEs puntuadas: 52
Fecha de la puntuación: 6/10/2026

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 access85 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %

Vulnerabilidad de amplificación de datos en cliente HTTP (elixir-tesla) explotable remotamente sin autenticación (PR:N, UI:N). El atacante envía respuestas comprimidas malformadas (decompression bomb) causando DoS por agotamiento de memoria (VA:H, denial of service).

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)

Elixir-tesla — Tesla

CWE

CWE-409

Referencias

JSON original (NVD)

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      "value": "Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in elixir-tesla tesla allows a denial of service via decompression bomb in HTTP response bodies.\n\nWhen Tesla.Middleware.DecompressResponse or Tesla.Middleware.Compression is included in a Tesla middleware pipeline, HTTP response bodies are decompressed eagerly with no size limit. The decompress_body/2 function in lib/tesla/middleware/compression.ex passes the entire response body to :zlib.gunzip/1 or :zlib.unzip/1 without any cap on the output size. Additionally, compression_algorithms/1 splits the content-encoding header on commas and decompress_body/2 recurses once per token, applying a decompression pass on each iteration. A server advertising content-encoding: gzip, gzip, gzip, gzip causes four recursive decompression passes, yielding exponential amplification: each gzip layer can expand its input roughly 1000x, so a payload of a few hundred bytes on the wire inflates to gigabytes of BEAM heap, exhausting memory and crashing or freezing the calling process.\n\nThis issue affects tesla: from 0.6.0 before 1.18.3."
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      "lang": "es",
      "value": "Vulnerabilidad de Manejo Inadecuado de Datos Altamente Comprimidos (Amplificación de Datos) en elixir-tesla tesla permite una denegación de servicio a través de una bomba de descompresión en los cuerpos de respuesta HTTP.\n\nCuando Tesla.Middleware.DecompressResponse o Tesla.Middleware.Compression se incluye en una tubería de middleware de Tesla, los cuerpos de respuesta HTTP se descomprimen de forma ávida sin límite de tamaño. La función decompress_body/2 en lib/tesla/middleware/compression.ex pasa el cuerpo completo de la respuesta a :zlib.gunzip/1 o :zlib.unzip/1 sin ningún límite en el tamaño de salida. Además, compression_algorithms/1 divide el encabezado content-encoding por comas y decompress_body/2 recurre una vez por token, aplicando un paso de descompresión en cada iteración. Un servidor que anuncia content-encoding: gzip, gzip, gzip, gzip causa cuatro pases de descompresión recursivos, lo que resulta en una amplificación exponencial: cada capa gzip puede expandir su entrada aproximadamente 1000 veces, por lo que una carga útil de unos pocos cientos de bytes en la red se infla a gigabytes de pila BEAM, agotando la memoria y bloqueando o congelando el proceso de llamada.\n\nEste problema afecta a tesla: desde 0.6.0 antes de 1.18.3."
    }
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  "lastModified": "2026-09-24T21:17:12.963",
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