Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck

CVE-2026-81095Timescale pg-aiguide through 0.5.0 DNS Rebinding via Disabled Host Header Allow-List

Medium 6.8

In plain English

A medium-severity security flaw in pg-aiguide from timescale. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.2%top 87.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
timescale	pg-aiguide	0 – through 0.5.0

Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

https://github.com/timescale/pg-aiguide product
https://github.com/timescale/pg-aiguide/pull/121 issue-tracking, patch
VulnCheck Advisory: Timescale pg-aiguide through 0.5.0 DNS Rebinding via Disabled Host Header Allow-List third-party-advisory