{"id":"CVE-2026-48594","aliases":["EEF-CVE-2026-48594","GHSA-mc85-72gr-vm9f"],"url":"https://o3.security/vulnerability/CVE-2026-48594","summary":"Decompression bomb in Tesla.Middleware.DecompressResponse and Tesla.Middleware.Compression","details":"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.","published":"2026-06-02T19:08:49.596Z","modified":"2026-08-12T03:51:28.471685896Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Hex","name":"tesla","fixedVersion":"1.18.3"}],"fix":{"url":"https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d","label":"elixir-tesla/tesla@340f75b"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-48594.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-48594"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48594.json"},{"type":"ADVISORY","url":"https://github.com/elixir-tesla/tesla/security/advisories/GHSA-mc85-72gr-vm9f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48594"},{"type":"FIX","url":"https://github.com/elixir-tesla/tesla/commit/340f75b5d191dc747ef7ac6365bd002d1cd55a9d"},{"type":"PACKAGE","url":"https://github.com/elixir-tesla/tesla"},{"type":"PACKAGE","url":"https://github.com/elixir-tesla/tesla.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.471685896Z"}}