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CVE-2026-108699— hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins

Quick assessment

Affected
hyper-mcp-rs hyper-mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hyper-mcp 版本 0.8.3 及更早版本存在一个不正确的签名验证漏洞，该漏洞允许攻击者加载恶意的 WebAssembly 插件，因为 默认接受任意签名者身份（signer identity）和 OIDC 发行者（OIDC issuer）。攻击者如果控制了一个插件镜像引用，就可以使用免费的 Sigstore 无证书密钥（keyless certificate）对该镜像进行签名，从而以配置的宿主机（host）、文件系统（filesystem）和环境（environment）权限执行这些恶意插件。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container

Affected Version Matrix 1

VendorProduct Version RangeStatus
hyper-mcp-rs hyper-mcp ≤ 0.8.3 affected
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I. Basic Information for CVE-2026-108699

Vulnerability Information
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Vulnerability Title
hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hyper-mcp-rs hyper-mcp 0 ~ 0.8.3 -

II. Public POCs for CVE-2026-108699

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-108699

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Vendor Advisories for CVE-2026-108699 (1)

News Coverage for CVE-2026-108699 (1)

Other References for CVE-2026-108699 (1)

IV. Related Vulnerabilities

Same product: hyper-mcp
Same vendor: hyper-mcp-rs
Same weakness: CWE-347

V. Comments for CVE-2026-108699

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