{"id":"CVE-2026-108698","published":"2026-10-11T14:17:04.113","lastModified":"2026-10-16T19:18:44.867","description":"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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N","cwes":["CWE-367"],"vendors":[],"products":[],"references":[{"url":"https://github.com/hyper-mcp-rs/hyper-mcp","tags":[]},{"url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L193-L224","tags":[]},{"url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L79-L148","tags":[]},{"url":"https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/hyper-mcp-oci-signature-manifest-toctou","tags":[]},{"url":"https://www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-oci-plugin-signature-verification-toctou-race-condition","tags":[]}],"exploitRefs":[{"url":"https://github.com/hyper-mcp-rs/hyper-mcp","tags":[]},{"url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L193-L224","tags":[]},{"url":"https://github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs#L79-L148","tags":[]}],"hasPoc":true,"ai":null}