hyper-mcp through 0.8.3 contains a signature verification bypass vulnerability in load_wasm in src/wasm/oci.rs that verifies the Cosign signature of a separately resolved tag rather than the loaded manifest. Attackers controlling registry responses for the tag can serve an unsigned malicious manifest to the loader and a signed one to Cosign, executing unsigned WebAssembly plugins with configured host capabilities.
History

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Hyper-mcp-rs
Hyper-mcp-rs hyper-mcp
Vendors & Products Hyper-mcp-rs
Hyper-mcp-rs hyper-mcp

Sun, 11 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Description hyper-mcp through 0.8.3 contains a signature verification bypass vulnerability in load_wasm in src/wasm/oci.rs that verifies the Cosign signature of a separately resolved tag rather than the loaded manifest. Attackers controlling registry responses for the tag can serve an unsigned malicious manifest to the loader and a signed one to Cosign, executing unsigned WebAssembly plugins with configured host capabilities.
Title hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition
Weaknesses CWE-367
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-11T13:25:58.805Z

Updated: 2026-10-13T16:59:55.905Z

Reserved: 2026-10-10T23:08:36.107Z

Link: CVE-2026-108698

cve-icon Vulnrichment

Updated: 2026-10-13T15:49:29.776Z

cve-icon NVD

Status : Deferred

Published: 2026-10-11T14:17:04.113

Modified: 2026-10-16T19:18:44.867

Link: CVE-2026-108698

cve-icon Redhat

No data.