{"id":"CVE-2026-108698","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.","modified":"2026-10-13T02:46:26.490265508Z","published":"2026-10-11T13:25:58.805Z","database_specific":{"cwe_ids":["CWE-367"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108698.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108698.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-2026-108698"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-oci-plugin-signature-verification-toctou-race-condition"},{"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/wasm/oci.rs#L193-L224"},{"type":"ARTICLE","url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L79-L148"}],"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-2026-108698.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"}]}