CVE-2026-108699
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductHyper-mcp
PublishedOct 11, 2026
First seenOct 11, 2026
Weakness typeCWE-347CWE-347
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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