Vulnerability in tesla (CVE-2026-48594)
Summary
Vulnerability in tesla (CVE-2026-48594). Risk of unauthorized operations or information disclosure. Exploitable via Tesla.Middleware.DecompressResponse. Mitigation: upgrade to 1.18.3 or later.
Original description
The description as published by the source.
Summary
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.
Configurations
The application must include Tesla.Middleware.DecompressResponse or Tesla.Middleware.Compression in its Tesla middleware pipeline.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-48594 has been found in tesla.
Attackers can target a specific entry point like Tesla.Middleware.DecompressResponse over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade tesla to 1.18.3 or later.
If unsure, ask your IT team or search "tesla CVE-2026-48594" on the vendor's site.
CVE-2026-48594 (tesla) — CWE-409 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Tesla.Middleware.DecompressResponse / Tesla.Middleware.Compression / tesla
Patched: 1.18.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-409) exists in tesla. Attackers reach the vulnerable code path via Tesla.Middleware.DecompressResponse without authentication.
Check the vendor advisory for the affected versions of tesla. Attack surface: Tesla.Middleware.DecompressResponse / Tesla.Middleware.Compression / tesla.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 1.18.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'tesla' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'tesla' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
teslaを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade tesla to 1.18.3ステージング環境で 1.18.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package hex.pm
- package github.com
- patch github.com
- web cna.erlef.org
- web osv.dev
- web github.com
- web github.com