{"schema":"threatline.record/2","record":{"id":"CVE-2026-108698","aliases":[],"summary":"hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition","details":"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.","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-2026-108698","source_modified_at":"2026-10-13T16:59:55.905Z","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":0.00243,"percentile":0.1461,"score_date":"2026-10-23"},"published_at":"2026-10-11T13:25:58.805Z","modified_at":"2026-10-13T16:59:55.905Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-108698","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-13T16:59:55.905Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-108698","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#L79-L148","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L193-L224","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-oci-plugin-signature-verification-toctou-race-condition","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-13T15:49:29.148966Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-13T16:59:55.905Z","content_hash":"25e2156d79665502dd83f2e67e19536a200a3f7fec4714fcffca304eb447a232"}}