PT-2026-45837 · Elixir Tesla · Tesla

Jonatan Männchen + 2 · Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-48594

Mitre

CVSS v4.0

8.2

High

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Fix

Weakness Enumeration

CWE-409

Related Identifiers

CVE-2026-48594

Affected Products

Tesla

References · 5

• https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d · Patch
• https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9f · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48594 · Security Note
• https://cna.erlef.org/cves/CVE-2026-48594.html · Note
• https://osv.dev/vulnerability/EEF-CVE-2026-48594 · Note