CVE-2026-34526 SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6
Attackers can bypass IP validation to access internal services via localhost or IPv6, potentially reading sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34526?
CVE-2026-34526 is a medium-severity server-side request forgery vulnerability in SillyTavern, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-34526?
2 open source packages ship an affected version, including sillytavern. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
sillytavern npm | All versions | 1.17.0 |
sillytavern npm | All versions | 1.17.0 |
Products include Sillytavern Sillytavern.
How do I fix CVE-2026-34526?
Upgrade sillytavern to 1.17.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-34526 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34526 exists.
Other vulnerabilities in SillyTavern
- CVE-2026-34524 SillyTavern: Path Traversal in `/api/chats/export` and `/api/chats/delete` allows arbitrary file read/delete within user data root
- CVE-2026-34522 SillyTavern: Path traversal in `/api/chats/import` allows arbitrary file write outside intended chat directory
- CVE-2026-26286 SillyTavern has Server-Side Request Forgery (SSRF) via Asset Download Endpoint that Allows Reading Internal Services
- CVE-2026-34523 SillyTavern: Path traversal allows file existence oracle
Sources
Also known as GHSA-wm7j-m6jm-8797.