CVE-2026-34526 json
SillyTavern: Incomplete IP validation in /api/search/visit allows SSRF via localhost and IPv6
published 2026-04-01 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-18444 , GHSA-wm7j-m6jm-8797
- cvss
- 5.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm sillytavern 1.17.0
- sillytavern sillytavern 1.17.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| GitHub | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | sillytavern | <1.17.0 |
1.17.0 |
Affected products
- SillyTavern SillyTavern
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/SillyTavern/SillyTavern/security/advisories/GHSA-wm7j-m6jm-8797
exploit, web, vendor-advisory
-
github.com
/SillyTavern/SillyTavern/releases/tag/1.17.0
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-34526
advisory
-
github.com
/SillyTavern/SillyTavern
package
Sources
- CVE List CVE-2026-34526
- GitHub Advisory GHSA-wm7j-m6jm-8797
- NVD CVE-2026-34526
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.