CVE-2026-35485: text-generation-webui has a Path Traversal in load_grammar() — arbitrary file read without authentication

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-07 · updated 2026-10-26
Weakness: CWE-22

Description

text-generation-webui is an open-source web interface for running Large Language Models. Prior to 4.3, an unauthenticated path traversal vulnerability in load_grammar() allows reading any file on the server filesystem with no extension restriction. Gradio does not server-side validate dropdown values, so an attacker can POST directory traversal payloads (e.g., ../../../etc/passwd) via the API and receive the full file contents in the response. This vulnerability is fixed in 4.3.

Affected products

oobabooga Textgen: before 4.3 — fixed in 4.3

How to fix

Upgrade to a fixed version: oobabooga Textgen 4.3. Check the vendor advisory for mitigations.

References

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