CVE-2026-81099

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Source

https://cve.org/CVERecord?id=CVE-2026-81099

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81099.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-81099

Published

2026-08-27T14:50:39Z

Modified

2026-10-28T02:31:08Z

Severity

7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Timescale tiger-slack DNS Rebinding via Disabled Host Header Allow-List

Details

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.

Database specific

{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-346"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81099.json"
}

References

Affected packages

Git / github.com/timescale/tiger-slack

Affected ranges

Type

GIT

Repo

https://github.com/timescale/tiger-slack

Events

Introduced

Fixed

23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "23faf7ee7e7f73e5ea4f67e627c1aca94bba1f09"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        }
    ]
}

Affected versions

v0.*

v0.1.1

v0.1.2

v0.1.3

v0.2.0

v0.2.1

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81099.json"