CVE-2026-108698
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductHyper-mcp
PublishedOct 11, 2026
First seenOct 11, 2026
Weakness typeCWE-367CWE-367
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hyper-mcp-rs hyper-mcp | v ≤ 0.8.3 | — |
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