CVE-2026-48594
Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression
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.
INFO
Published Date :
June 2, 2026, 8:16 p.m.
Last Modified :
July 22, 2026, 7:10 p.m.
Remotely Exploit :
Yes !
Source :
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | ||||
| CVSS 4.0 | HIGH | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Solution
- Update elixir-tesla to version 1.18.3 or later.
- Limit decompression output size in middleware.
- Apply decompression limits in the server.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48594.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48594 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48594
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48594 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48594 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 22, 2026
Action Type Old Value New Value Added Translation Title: tesla de elixir-tesla, Description: 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. Cuando 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. Este problema afecta a tesla: desde 0.6.0 antes de 1.18.3. -
CVE Modified by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/elixir-tesla/tesla', 'vendor': 'elixir-tesla', 'modules': ["'Elixir.Tesla.Middleware.Compression'", "'Elixir.Tesla.Middleware.DecompressResponse'"], 'product': 'tesla', 'versions': [{'status': 'affected', 'version': '0.6.0', 'lessThan': '1.18.3', 'versionType': 'semver'}], 'packageURL': 'pkg:hex/tesla', 'packageName': 'tesla', 'programFiles': ['lib/tesla/middleware/compression.ex'], 'collectionURL': 'https://repo.hex.pm', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Tesla.Middleware.DecompressResponse':call/3"}, {'name': "'Elixir.Tesla.Middleware.Compression':call/3"}]}, {'cpes': ['cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/elixir-tesla/tesla.git', 'vendor': 'elixir-tesla', 'modules': ["'Elixir.Tesla.Middleware.Compression'", "'Elixir.Tesla.Middleware.DecompressResponse'"], 'product': 'tesla', 'versions': [{'status': 'affected', 'version': '5bd90bb5cf0d15e375edc2a66fa322292940fce2', 'lessThan': '340f75b5d191dc747ef7ac6365bd002d1cd55a9d', 'versionType': 'git'}], 'packageURL': 'pkg:github/elixir-tesla/tesla', 'packageName': 'elixir-tesla/tesla', 'programFiles': ['lib/tesla/middleware/compression.ex'], 'collectionURL': 'https://github.com', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Tesla.Middleware.DecompressResponse':call/3"}, {'name': "'Elixir.Tesla.Middleware.Compression':call/3"}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48594', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-03T14:39:48.594599Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 03, 2026
Action Type Old Value New Value Added Reference https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9f -
New CVE Received by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Jun. 02, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-409 Added Reference https://cna.erlef.org/cves/CVE-2026-48594.html Added Reference https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d Added Reference https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9f Added Reference https://osv.dev/vulnerability/EEF-CVE-2026-48594