Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Elixir-Tesla | Tesla | >= 0.6.0, < 1.18.3 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-48594.htmlThird Party Advisory
- https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cdPatch
- https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9fVendor AdvisoryExploit
- https://osv.dev/vulnerability/EEF-CVE-2026-48594Third Party Advisory
- https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9fVendor AdvisoryExploit
FAQ
What is CVE-2026-48594?
CVE-2026-48594 is a vulnerability with a CVSS score of 7.5 (HIGH). 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.D...
How severe is CVE-2026-48594?
CVE-2026-48594 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48594?
Check the references section above for vendor advisories and patch information. Affected products include: Elixir-Tesla Tesla.