Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression_CVE-2026-48594

8.2 / 10

HIGH

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

Description

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. 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.

Basic Information

ID CVE-2026-48594

Source EEF

Published Jun 2, 2026 at 19:08

Modified Jun 2, 2026 at 19:12

Affected Product

Vendor elixir-tesla

Product tesla

Version 0.6.0

Affected Versions elixir-tesla tesla 0.6.0
elixir-tesla tesla 5bd90bb5cf0d15e375edc2a66fa322292940fce2

CWE Classification

CWE-409

References

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    "published": "2026-06-02T19:08:49.596Z",
    "modified": "2026-06-02T19:12:25.393Z",
    "type": "cve",
    "title": "Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression",
    "source": "EEF",
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