{"id":"CVE-2026-48594","state":"PUBLISHED","title":"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.\n\nWhen 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.\n\nThis issue affects tesla: from 0.6.0 before 1.18.3.","publishedAt":"2026-06-02T19:08:49.596Z","updatedAt":"2026-09-24T20:50:12.704Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"EEF"},"assigner":"EEF","products":["elixir-tesla tesla"],"affected":[{"vendor":"elixir-tesla","product":"tesla","packageName":"tesla","packageURL":"pkg:hex/tesla","defaultStatus":"unaffected","versions":[{"version":"0.6.0","status":"affected","lessThan":"1.18.3","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Tesla.Middleware.Compression'","'Elixir.Tesla.Middleware.DecompressResponse'"],"programFiles":["lib/tesla/middleware/compression.ex"],"programRoutines":[{"name":"'Elixir.Tesla.Middleware.DecompressResponse':call/3"},{"name":"'Elixir.Tesla.Middleware.Compression':call/3"}],"repo":"https://github.com/elixir-tesla/tesla"},{"vendor":"elixir-tesla","product":"tesla","packageName":"elixir-tesla/tesla","packageURL":"pkg:github/elixir-tesla/tesla","defaultStatus":"unaffected","versions":[{"version":"5bd90bb5cf0d15e375edc2a66fa322292940fce2","status":"affected","lessThan":"340f75b5d191dc747ef7ac6365bd002d1cd55a9d","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-tesla:tesla:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Tesla.Middleware.Compression'","'Elixir.Tesla.Middleware.DecompressResponse'"],"programFiles":["lib/tesla/middleware/compression.ex"],"programRoutines":[{"name":"'Elixir.Tesla.Middleware.DecompressResponse':call/3"},{"name":"'Elixir.Tesla.Middleware.Compression':call/3"}],"repo":"https://github.com/elixir-tesla/tesla"}],"references":["https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9f","https://cna.erlef.org/cves/CVE-2026-48594.html","https://osv.dev/vulnerability/EEF-CVE-2026-48594","https://github.com/elixir-tesla/tesla/commit/5bd90bb5cf0d15e375edc2a66fa322292940fce2","https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d"],"weaknesses":["CWE-409"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48594.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48594","state":"PUBLISHED","datePublished":"2026-06-02T19:08:49.596Z","dateUpdated":"2026-09-24T20:50:12.704Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-05-22T09:36:56.834Z"},"containers":{"cna":{"title":"Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression","descriptions":[{"lang":"en","value":"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.\n\nWhen 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.\n\nThis issue affects tesla: from 0.6.0 before 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CNA record for CVE-2026-48594","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-48594","name":"OSV record EEF-CVE-2026-48594","tags":["related"]},{"url":"https://github.com/elixir-tesla/tesla/commit/5bd90bb5cf0d15e375edc2a66fa322292940fce2","name":"Introducing commit 5bd90bb in elixir-tesla/tesla","tags":["related"]},{"url":"https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d","name":"Fix commit 340f75b in 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