CVE-2026-48597
Summary
In the Mint adapter for the Tesla HTTP client library, Tesla.Adapter.Mint.open_conn/2 passes the URL scheme of every outgoing request through String.to_atom/1 with no allow-list validation. Because BEAM atoms are permanent (never garbage-collected) and the atom table is bounded at roughly 1,048,576 entries, an attacker who can vary the URL scheme across requests can mint one fresh atom per request and eventually exhaust the table, crashing the VM.
Details
Vulnerable call (lib/tesla/adapter/mint.ex, open_conn/2): the scheme field parsed from the request URI is passed directly to String.to_atom/1 before being forwarded to Mint.HTTP.connect/4. Even though Mint raises for unrecognised schemes, the atom is already interned by that point. The function's HTTPS-branch guard confirms that no scheme normalisation occurs beforehand.
The attack surface has two entry points. First, any application-level URL-forwarding feature (webhook relay, link preview, SSRF-style proxy) where untrusted input reaches Tesla.get/2 or equivalent. Second, any pipeline that includes Tesla.Middleware.FollowRedirects: a server under the attacker's control can return a Location header with a novel scheme, triggering the atom creation on the redirect follow.
PoC
1. Stand up any application that accepts a user-supplied URL and forwards it through Tesla.Adapter.Mint.
2. Send requests to the application, each with a distinct, previously unseen URL scheme (e.g. atk1://, atk2://, ...).
3. Each request interns one new permanent atom; Mint rejects the connection but the atom persists.
4. After approximately 1,000,000 requests the BEAM atom table is exhausted and the VM crashes.
Impact
High severity (CVSS v4.0: 8.2). Any application using tesla 1.3.0 through 1.18.2 with Tesla.Adapter.Mint that allows untrusted input to influence request URLs is vulnerable to remote denial of service. No authentication or special privileges are required beyond access to the application's HTTP endpoint. Fixed in
⚡ Watch CVE-2026-48597
Get an email if CVE-2026-48597 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
Advisory coverage (1)
- highGHSA-h74c-q9j7-mpcm: Tesla vulnerable to atom exhaustion via untrusted URL schemeghsa · 2026-07-10
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-48597)