Vulnerability · Published Oct 25, 2026 · Assigned by VulnCheck

CVE-2026-116073Leon before commit 50df142 Path Traversal via /download model Command

Medium 6.5

In plain English

A medium-severity path traversal in leon from leon-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 74.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Leon before commit 50df142 contains a path traversal vulnerability in getModelFileNameFromURL() that allows attackers to write files outside the models directory via percent-encoded separators. Attackers can trick a user into running '/download model' with a crafted URL containing encoded '../' sequences to write attacker-controlled content to arbitrary paths writable by Leon.

Affected products (as reported)

Vendor	Product	Versions
leon-ai	leon	a3afdef81c8dd085b922f5a4e6b68bb9b9d802e4 – before 50df142a89a0859e5b7283d87afdab7b01e712a2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References

GitHub Issue #593 issue-tracking
https://github.com/leon-ai/leon product
https://github.com/leon-ai/leon/blob/21baf11714f618a9367f25882e59e856d3308037/server/src/built-in-command/commands/download-command/download-command.ts#L21-L28 technical-description
https://github.com/leon-ai/leon/pull/594 patch, issue-tracking
https://github.com/leon-ai/leon/commit/50df142a89a0859e5b7283d87afdab7b01e712a2 patch
VulnCheck Advisory: Leon before commit 50df142 Path Traversal via /download model Command third-party-advisory