{"id":"CVE-2026-108698","revision":"2cc3b42c8ff14eefa6ed6754266281fa","records":[{"revision":"2cc3b42c8ff14eefa6ed6754266281fa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108698","aliases":[],"title":"hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition","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.","state":0,"publishedAt":"2026-10-11T13:25:58.805+00:00","modifiedAt":"2026-10-13T16:59:55.905+00:00","affected":[{"ecosystem":"Vendor product","name":"hyper-mcp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"hyper-mcp-rs\",\n                    \"product\": \"hyper-mcp\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"0.8.3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:cargo/hyper-mcp\",\n                    \"repo\": \"https://github.com/hyper-mcp-rs/hyper-mcp\"\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.3,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/hyper-mcp-oci-signature-manifest-toctou","https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L79-L148","https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L193-L224","https://github.com/hyper-mcp-rs/hyper-mcp","https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-oci-plugin-signature-verification-toctou-race-condition"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108698","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108698","identifiers":["CVE-2026-108698"]},"retained":false,"historicalAffected":[]}],"coverage":[]}