CVE-2026-34526 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in SillyTavern versions prior to 1.17.0. The issue arises in the search endpoint, where hostname validation only permits literal dotted-quad IPv4 addresses. This oversight allows bypassing the validation with localhost, IPv6 loopback addresses, and certain DNS names that resolve to internal addresses. Although a separate port check restricts exploitation to default ports, this vulnerability still poses a moderate risk by enabling authenticated users to access internal services on those ports.
Users can upgrade to SillyTavern version 1.17.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0 | [email protected] | Release Notes |
| https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| sillytavern sillytavern | < 1.17.0 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 13, 2026 | Initial Analysis | [email protected] |
| Apr 2, 2026 | New CVE Received | [email protected] |
| Apr 2, 2026 | CVE Modified | CISA-ADP |