{"schema":"threatline.record/2","record":{"id":"CVE-2026-108699","aliases":[],"summary":"hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins","details":"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.","categories":["Unclassified"],"product":"hyper-mcp","vendor":"hyper-mcp-rs","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-108699","source_modified_at":"2026-10-13T19:35:43.889Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"hyper-mcp","vendor":"hyper-mcp-rs","versions":[{"version":"0","lessThanOrEqual":"0.8.3","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.3,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00134,"percentile":0.02653,"score_date":"2026-10-23"},"published_at":"2026-10-11T13:25:59.469Z","modified_at":"2026-10-13T19:35:43.889Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-108699","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-13T19:35:43.889Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-108699","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/hyper-mcp-oci-signature-manifest-toctou","tags":["third-party-advisory"]},{"source":"CVE List","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L157-L190","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/config.rs#L138-L170","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/hyper-mcp-rs/hyper-mcp","tags":["product"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-improper-signature-verification-of-oci-webassembly-plugins","tags":["third-party-advisory"]},{"source":"CVE List","url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/cve-2026-108698-108699-hyper-mcp-oci-signature-manifest-toctou","tags":["exploit"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-13T19:35:14.241288Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-13T19:35:43.889Z","content_hash":"cda495fb383fae7c1f81e6c4f032e3865f4b5d92ad67ed8b02ea069381c985ea"}}