CVE-2026-86242
High · CVSS 8.1Published 2026-09-06
CVSS
8.1
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-86242?
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.
CVSS Score Explained
CVSS 8.1 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/maximhq/bifrost
- ›https://github.com/maximhq/bifrost/commit/e0057ff355f831c251eabe9d0e44f3a3748532c6
- ›https://github.com/maximhq/bifrost/pull/5763
- PATCHhttps://github.com/maximhq/bifrost/releases/tag/transports/v2.0.0
- ›https://github.com/maximhq/bifrost/security/advisories/GHSA-2qp8-4xgm-fw6g
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