CVE WatchOct 1, 2026

CVE-2026-55096

fast-mcp-telegram is a Telegram MCP Server. Prior to version 30.1, the send_message/send_message_to_phone MCP tools accept files as a list o

CVSS

7.1

High

EPSS

0.3%

p17

KEV

—

Exploit Today

0-100

Published: Sep 28, 2026 · Last modified: Oct 1, 2026 · CWE-184 · CWE-918

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-09-292026-10-25

Technical description

fast-mcp-telegram is a Telegram MCP Server. Prior to version 30.1, the send_message/send_message_to_phone MCP tools accept files as a list of http(s) URLs, which the server downloads and attaches to the outgoing Telegram message. Downloads are guarded by _validate_url_security, an SSRF denylist that checks the URL's literal hostname string but never resolves DNS. The fetch (httpx.AsyncClient.get) does its own resolution at request time. Consequently a hostname that resolves to a loopback / private / link-local address passes the guard and is fetched — even with the secure defaults block_private_ips=True and allow_http_urls=False. Because the fetched body is returned to the attacker as a Telegram file attachment, this is a full-read, exfiltrating SSRF, not blind. This issue has been patched in version 30.1.

Official references

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