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Advisories

hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins

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severity
high
date
Affecting

  • hyper-mcp <= 0.8.3

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
8.3
CVSS V4 Vector
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
Credit
hieuPenguinnn
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.

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