Vulnerability in Timescale Pg-Aiguide
CVE-2026-81095
pg-aiguide started its MCP HTTP transport without enabling the host allow-list the underlying SDK provides. src/httpServer.ts called the shared httpServerFactory helper and never set the DNS-rebinding-protection option, so the transport accepted a request whatever host it named. A page in a browser could therefore point a name it controlled at the address the server was bound to and drive the locally reachable MCP server through the visitor's browser. The protection was already available in the packaged transport and simply not turned on, so updating the dependency alone would not have closed it. Version 0.5.1 passes the option explicitly.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% 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: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/timescale/pg-aiguide (product)
- github.com/timescale/pg-aiguide/pull/121 (issue-tracking, patch)
- www.vulncheck.com/advisories/timescale-pg-aiguide-through-0.5.0-dns-rebinding-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-81095?
- CVE-2026-81095 is a medium-severity vulnerability in Timescale Pg-Aiguide, classified under Origin Validation Error. CVSS score: 6.8/10. Published 2026-08-27.
- How severe is CVE-2026-81095?
- Medium severity. CVSS v3 base score is 6.8 out of 10.