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Advisories

hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition

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severity
high
date
Affecting

  • hyper-mcp <= 0.8.3

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
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 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.

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