Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The utcp-http package, versions below 1.1.4, trusts the tokenUrl field in remote OpenAPI OAuth2 security schemes without URL validation. An attacker who supplies a malicious OpenAPI spec can, once a victim registers it and calls one of its OAuth2-protected tools, receive the victim's client_id and client_secret, or direct requests to internal services. Upgrade utcp-http to 1.1.4 or later; the source lists no other workaround beyond refusing OpenAPI specs that declare OAuth2.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.1 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS No score.
Timeline
- 31 Oct 2026, 14:39 UTC First seen by agentprime
- 31 Oct 2026, 14:39 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8cp3-qxj6-px34
- OSV: GHSA-8cp3-qxj6-px34
- github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-8cp3-qxj6-px34
- github.com/universal-tool-calling-protocol/python-utcp/commit/fc3268e2a62e1181f91a63faf0a9bcee7639db29
- github.com/universal-tool-calling-protocol/python-utcp