elixir-tesla up to 1.18.2 compression.ex decompress_body data amplification

Summaryinfo

A vulnerability was found in elixir-tesla tesla up to 1.18.2. It has been declared as problematic. The affected element is the function decompress_body in the library lib/tesla/middleware/compression.ex. Such manipulation leads to data amplification. This vulnerability is documented as CVE-2026-48594. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in elixir-tesla tesla up to 1.18.2. Affected by this issue is the function decompress_body in the library lib/tesla/middleware/compression.ex. The manipulation with an unknown input leads to a data amplification vulnerability. Using CWE to declare the problem leads to CWE-409. The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. Impacted is availability. CVE summarizes:

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.

The weakness was released by Peter Ullrich and Jonatan Männchen as GHSA-mc85-72gr-vm9f. The advisory is available at github.com. This vulnerability is handled as CVE-2026-48594 since 05/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.18.3 eliminates this vulnerability. Applying the patch 340f75b5d191dc747ef7ac6365bd002d1cd55a9d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Vehicle Software

Vendor

• elixir-tesla

Name

• tesla

Version

• 1.18.0
• 1.18.1
• 1.18.2

License

• open-source

Website

• Product: https://github.com/elixir-tesla/tesla/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion