{"id":"CVE-2026-108699","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.","modified":"2026-10-13T02:45:26.023860004Z","published":"2026-10-11T13:25:59.469Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108699.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-347"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108699.json"},{"type":"ADVISORY","url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/hyper-mcp-oci-signature-manifest-toctou"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108699"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-improper-signature-verification-of-oci-webassembly-plugins"},{"type":"PACKAGE","url":"https://github.com/hyper-mcp-rs/hyper-mcp"},{"type":"ARTICLE","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/config.rs#L138-L170"},{"type":"ARTICLE","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L157-L190"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/hyper-mcp-rs/hyper-mcp","events":[{"introduced":"0"},{"fixed":"08353e866c53ff072af932bd977180596a3746f3"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.8.3"},{"fixed":"0.8.3"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v0.8.2","v0.8.1","v0.8.0","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.1","v0.6.0","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.7","v0.4.6","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.0","v0.3.1","v0.3.0","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.8","v0.1.7","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108699.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}