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CVE-2026-108698— hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition

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 0.8.3 及更早版本存在一个签名验证绕过漏洞，该漏洞位于 src/wasm/oci.rs 文件中的 load_wasm 函数内。该漏洞的问题在于，它验证的是单独解析的标签（tag）的 Cosign 签名，而非实际加载的清单（manifest）。攻击者若能够控制 registry 对标签的响应，便可向加载器提供未签名的恶意清单，同时向 Cosign 提供已签名的清单，从而执行未签名但具有已配置主机能力的 WebAssembly 插件。

CVSS 6.5 · Medium EPSS 0.24% · P14

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-2026-108698

Vulnerability Information
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Vulnerability Title
hyper-mcp through 0.8.3 OCI Plugin Signature Verification TOCTOU Race Condition
Source: CVE Program / CVE List V5
Vulnerability 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.
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
检查时间与使用时间(TOCTOU)的竞争条件
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-2026-108698

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III. Intelligence Information for CVE-2026-108698

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Vendor Advisories for CVE-2026-108698 (1)

News Coverage for CVE-2026-108698 (1)

Other References for CVE-2026-108698 (1)

IV. Related Vulnerabilities

Same product: hyper-mcp
Same vendor: hyper-mcp-rs
Same weakness: CWE-367

V. Comments for CVE-2026-108698

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