CVE-2026-48597

Atom table exhaustion via untrusted URL scheme in Tesla.Adapter.Mint

State: Published
Severity: 8.2 High
Published: Jun 2, 2026
Updated: Sep 24, 2026
Reserved: May 22, 2026

Description

Allocation of Resources Without Limits or Throttling vulnerability in elixir-tesla tesla allows denial of service via atom table exhaustion in Tesla.Adapter.Mint.

Tesla.Adapter.Mint.open_conn/2 converts the URL scheme of every outgoing request to a BEAM atom via String.to_atom(uri.scheme) with no allow-list validation. BEAM atoms are never garbage-collected and the atom table is bounded (approximately 1,048,576 entries by default). An attacker who can influence the URL of a Tesla request — either via an application-level URL-forwarding feature (webhook, proxy, importer) or via a Location header returned by a server when Tesla.Middleware.FollowRedirects is in the pipeline — can mint one fresh permanent atom per request by varying the scheme string. After enough requests the atom table fills and the VM crashes, taking down the entire application.

This issue affects tesla: from 1.3.0 before 1.18.3.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	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	EEF

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
teslaelixir-tesla	1.3.0 to before 1.18.3Affected
teslaelixir-tesla	ccd0823d4ba37581a37d8f6108f9a81b263237ef to before 4699c3cb3e2fd6078f99f45f11cf7466aeedbf0eAffected

References

https://github.com/elixir-tesla/tesla/security/advisories/GHSA-h74c-q9j7-mpcmvendor-advisoryrelated
EEF CNA record for CVE-2026-48597related
OSV record EEF-CVE-2026-48597related
Introducing commit ccd0823 in elixir-tesla/teslarelated
Fix commit 4699c3c in elixir-tesla/teslapatch

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