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

Quick assessment

Affected
timescale pg-aiguide
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在启动其 MCP HTTP 传输层时，未启用底层 SDK 提供的“主机白名单”（host allow-list）机制。具体而言， 调用了共享的 辅助函数，但从未设置 DNS 重绑定（DNS-rebinding）防护选项，导致该传输层会接受来自任意 头的请求。因此，攻击者可通过页面中的浏览器，将其控制的域名指向服务器绑定的地址，从而通过访问者的浏览器操控本地可访问的 MCP 服务器。该防护机制在打包的传输层中已经可用，只是未被启用，因此仅更新依赖项本身并不能修复此问题。版本 0.5.1 通过显式传递该选项，从而关闭了

CVSS 6.8 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
timescale pg-aiguide ≤ 0.5.0 affected
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I. Basic Information for CVE-2026-81095

Vulnerability Information
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Vulnerability Title
Timescale pg-aiguide through 0.5.0 DNS Rebinding via Disabled Host Header Allow-List
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
timescale pg-aiguide 0 ~ 0.5.0 -

II. Public POCs for CVE-2026-81095

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III. Intelligence Information for CVE-2026-81095

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Patches & Fixes for CVE-2026-81095 (1)

Vendor Advisories for CVE-2026-81095 (1)

Same Patch Batch · timescale · 2026-08-27 · 3 CVEs total

CVE-2026-81099 6.8 MEDIUM Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List
CVE-2026-81100 6.8 MEDIUM Timescale tiger-gh-mcp-server DNS Rebinding via Disabled Host Header Allow-List

IV. Related Vulnerabilities

Same vendor: timescale
Same weakness: CWE-346

V. Comments for CVE-2026-81095

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