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CVE-2026-108699

8.3 high SSVC exploitation: poc Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → DeferredNVD modified 2026-10-16 19:21
  2. First seenCVSS 8.3NVD modified 2026-10-13 20:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 6