Public proof of conceptFix available

CVE-2026-34526

Q: Is CVE-2026-34526 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34526, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2026-34526?

CVE-2026-34526 has a CVSS v3 base score of 5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.

A public proof of concept exists; no exploitation attested.

Published2026-04-02
Fixed in1.17.0
WeaknessCWE-918

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-04-0218:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34526?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34526?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Sillytavern

Branch	Affected	Fixed in	Source
1.17	< 1.17.0	1.17.0	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Sillytavern to 1.17.0

Advisories and patches

github.comRelease Notes
github.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionpoc2026-04-02
OpenCVESSVC decisionpoc—
CNACVSS 3.15read 2026-10-23
CNAweakness (CWE)CWE-918read 2026-10-23
FIRST EPSSEPSS score0.3 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Published: 2026-04-02
Last Modified: 2026-07-24
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-34526?

Is CVE-2026-34526 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34526, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34526?

CVE-2026-34526 has a CVSS v3 base score of 5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.

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