Vulnerability in hyper-mcp-rs hyper-mcp

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/hyper-mcp-rs/hyper-mcp
• github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs
• github.com/hyper-mcp-rs/hyper-mcp/blob/v0.8.3/src/wasm/oci.rs
• hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/hyper-mcp-oci-signature-manifest-toctou
• www.vulncheck.com/advisories/hyper-mcp-through-0.8.3-oci-plugin-signature-verification-…