CVE-2026-44661Network attack vector

SSRF via unvalidated OpenAPI server URL

Published May 14, 2026 · Updated May 14, 2026

SSRF in the utcp-http plugin for Python UTCP 1.1.2 and earlier allows remote attackers to reach internal services via a malicious OpenAPI spec. The OpenAPI converter trusts servers[0].url, and call_tool() and call_tool_streaming() issue requests to the resolved URL without revalidating it. Exploitation requires an agent to register the attacker's HTTPS specification; successful requests can expose loopback services, cloud metadata, or other firewalled endpoints to the LLM.

CVSS severity4.7
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in the utcp-http plugin for Python UTCP 1.1.2 and earlier allows remote attackers to reach internal services via a malicious OpenAPI spec. The OpenAPI converter trusts servers[0].url, and call_tool() and call_tool_streaming() issue requests to the resolved URL without revalidating it. Exploitation requires an agent to register the attacker's HTTPS specification; successful requests can expose loopback services, cloud metadata, or other firewalled endpoints to the LLM.

The record

CVE
CVE-2026-44661
Published
May 14, 2026
Updated
May 14, 2026
Vendor
Universal Tool Calling Protocol
Product
Python UTCP
Classifications
CWE-918, T1552.005, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Universal Tool Calling Protocol · Python UTCPversion=< 1.1.2

Published CVSS scores

4.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API
T1046Network Service Scanning

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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