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CVE-2026-86242— Unauthenticated RCE via Custom Plugin HTTP Path on Dynamically Linked Builds

Quick assessment

Affected
maximhq Bifrost
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.

Bifrost 中 HTTP 传输层在 2.0.0 版本之前，当管理认证被禁用时（即默认配置 ），会在 的未认证 POST 请求中接受一个已启用的自定义插件，且该插件路径为 HTTP URL。共享对象加载器会将带有 前缀的路径视为下载 URL，将响应体写入一个临时的 文件，并将其传递给 Go 的 函数。成功加载后，可选的 函数会立即以 Bifrost 进程的用户身份运行，并使用提供的配置。 在厂商要求用于自定义 Go 插件的、文档中记载的动态链接构建（ 或未设置静态链接标志）下， 预期会成功，因此这构成了未认证的远

CVSS 8.1 · High EPSS 0.62% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
maximhq Bifrost < 2.0.0 affected
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I. Basic Information for CVE-2026-86242

Vulnerability Information
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Vulnerability Title
Unauthenticated RCE via Custom Plugin HTTP Path on Dynamically Linked Builds
Source: CVE Program / CVE List V5
Vulnerability Description
Bifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.auth_config.is_enabled=false). The shared-object loader treats an http-prefixed path as a download URL, writes the body to a temporary .so, and passes it to Go's plugin.Open. After a successful open, optional Init runs immediately with the supplied config as the Bifrost process user. On documented dynamically linked builds (DYNAMIC=1 / no static-link flags), which the vendor requires for custom Go plugins, plugin.Open is expected to succeed and this is unauthenticated remote code execution. On the published statically linked Docker image, plugin.Open fails with Dynamic loading not supported, so that build class is only server-side request forgery. Attack complexity is High because the attacker cannot force RCE on the default static image and a loadable plugin must match the host Go version, OS, architecture, and linkage. The 1.6.x HTTP transport line through 1.6.11 does not contain the fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
maximhq Bifrost 0 ~ 2.0.0 -

II. Public POCs for CVE-2026-86242

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III. Intelligence Information for CVE-2026-86242

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Patches & Fixes for CVE-2026-86242 (2)

Vendor Advisories for CVE-2026-86242 (1)

Proof of Concept for CVE-2026-86242 (1)

IV. Related Vulnerabilities

Same product: Bifrost
Same vendor: maximhq
Same weakness: CWE-94

V. Comments for CVE-2026-86242

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