CVE-2026-34526

SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, in src/endpoints/search.js, the hostname is checked against /^\d+\.\d+\.\d+\.\d+$/. This only matches literal dotted-quad IPv4 (e.g. 127.0.0.1, 10.0.0.1). It does not catch: localhost (hostname, not dotted-quad), [::1] (IPv6 loopback), and DNS names resolving to internal addresses (e.g. localtest.me -> 127.0.0.1). A separate port check (urlObj.port !== '') limits exploitation to services on default ports (80/443), making this lower severity than a fully unrestricted SSRF. This issue has been patched in version 1.17.0.

• CWE-918

• https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0Release Notes
• https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797Exploit, Vendor Advisory
• https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797Exploit, Vendor Advisory

Published

Apr 2, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

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