CVE-2026-108699

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

Published Oct 11, 2026 CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 13, 2026, 7:35 PM
Reserved
Oct 10, 2026, 11:08 PM
Status
Deferred
Published
Oct 11, 2026, 2:17 PM
Modified
Oct 16, 2026, 7:21 PM