{"id":"CVE-2026-108699","revision":"7421fea248184a0391da6c791415846e","records":[{"revision":"7421fea248184a0391da6c791415846e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108699","aliases":[],"title":"hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins","description":"hyper-mcp through 0.8.3 contains an improper signature verification vulnerability that allows attackers to load malicious WebAssembly plugins because cosign_verify_args() accepts any signer identity and OIDC issuer by default. Attackers controlling a plugin image reference can sign a malicious image with a free Sigstore keyless certificate to execute plugins with configured host, filesystem, and environment capabilities.","state":0,"publishedAt":"2026-10-11T13:25:59.469+00:00","modifiedAt":"2026-10-13T19:35:43.889+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#L157-L190","https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/config.rs#L138-L170","https://github.com/hyper-mcp-rs/hyper-mcp","https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-improper-signature-verification-of-oci-webassembly-plugins"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108699","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108699","identifiers":["CVE-2026-108699"]},"retained":false,"historicalAffected":[]}],"coverage":[]}