SSRF in Sillytavern
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Sillytavern — versions < 1.17.0
Weakness classification (CWE)
References
- github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797 (Exploit, Vendor Advisory)
- github.com/SillyTavern/SillyTavern/releases/tag/1.17.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-34526?
- CVE-2026-34526 is a medium-severity vulnerability in Sillytavern, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-04-02.
- How severe is CVE-2026-34526?
- Medium severity. CVSS v3 base score is 5.0 out of 10.