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.
Published: 2026-10-11
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 13 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 13 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 13 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Hyper-mcp-rs
Hyper-mcp-rs hyper-mcp
Vendors & Products Hyper-mcp-rs
Hyper-mcp-rs hyper-mcp

Sun, 11 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
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.
Title hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

cvssV4_0

{'score': 8.3, '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'}

Subscriptions

Hyper-mcp-rs Hyper-mcp
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-13T19:35:43.889Z

Reserved: 2026-10-10T23:08:36.419Z

Link: CVE-2026-108699

cve-icon Vulnrichment

Updated: 2026-10-13T19:35:36.590Z

cve-icon NVD

Status : Received

Published: 2026-10-11T14:17:04.257

Modified: 2026-10-13T20:17:21.917

Link: CVE-2026-108699

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T07:57:49Z

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature