CVE-2026-102610

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 38/100
Published: 2026-11-06 Modified: 2026-11-12 First seen: 2026-11-06 Status: active

Attack Surface

Network Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: High
UI: Required
S: Unchanged
C: High
I: High
A: High

Description

fast-agent is a framework for building, running, and evaluating AI agents with Model Context Protocol support. Prior to 0.7.21, fast-agent serve uses HTTP transport bound to 0.0.0.0 on port 8000 without authentication, allowing any network client that can reach the /mcp endpoint to invoke the exposed agent tool. When the server is started with --shell, the agent can call the local execute tool implemented by tools/local_shell_executor.py, so an unauthenticated remote client can cause operating-system commands to run as the server user; without --shell, the client can still consume the operator's model and configured MCP tools. The defaults are defined in cli/commands/serve.py and mcp/server/agent_server.py, and the non-interactive server permission prompt does not prevent the described access. This issue is fixed in version 0.7.21.

Weakness Classification (2)

Affected Software (2)

VendorProductVersion
evalstate fast-agent < 0.7.21
evalstate fast-agent < 0.7.21

Bug Bounty Relevance

38 / 100
✓ Network accessible

CVSS Score

6.4 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

0.29%
Raw Score 0.002910
Percentile 22.0%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00291
2026-11-12
0.00291
2026-11-10
0.00291
2026-11-09
0.00291
2026-11-08
0.00291
2026-11-07
0.00291

Intelligence Sources

mitre ref →
nvd ref →