Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression
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.
CVE-2026-48594
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-48594
tesla
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
tesla
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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",
"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"
}
]
}
]- Related CVEs
- CVE-2026-48594
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #1895 · Revision 1
- Added to Heist Feed
- Publisher date