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CVE-2026-81099— Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List

Quick assessment

Affected
timescale tiger-slack
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.

漏洞描述翻译： 在启动其 MCP HTTP 传输层时，未启用底层 SDK 提供的“主机允许列表”机制。具体而言， 调用了共享的 辅助函数，但始终未设置用于 DNS 重绑定保护的相关选项。因此，该传输层会接受任意 头中指定的主机名，导致浏览器中的网页可以通过控制一个指向服务器实际绑定地址的域名，经由访客的浏览器驱动本地可访问的 Slack MCP 服务器。 修复方案是显式传入该选项，并伴随一次依赖更新；仅进行依赖更新本身无法完全修复此问题。由于该仓库未发布涵盖此修复的版本，因此受影响的范围界定为修复提交之前的提交版本

CVSS 6.8 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
timescale tiger-slack 23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09 unaffected
< 23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09 affected
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I. Basic Information for CVE-2026-81099

Vulnerability Information
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Vulnerability Title
Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List
Source: CVE Program / CVE List V5
Vulnerability Description
tiger-slack started its MCP HTTP transport without enabling the host allow-list the underlying SDK provides. mcp/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, and a page in a browser could point a name it controlled at the address the server was bound to and drive the locally reachable Slack MCP server through the visitor's browser. The fix passes the option explicitly alongside a dependency update; the update alone would not have closed it. The repository publishes no release that brackets the fix, so the affected boundary is the commit preceding it.
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 tiger-slack 0 ~ 23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09 -

II. Public POCs for CVE-2026-81099

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III. Intelligence Information for CVE-2026-81099

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Patches & Fixes for CVE-2026-81099 (1)

Vendor Advisories for CVE-2026-81099 (1)

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

CVE-2026-81095 6.8 MEDIUM Timescale pg-aiguide through 0.5.0 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-2026-81099

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