Description
knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| knowns-dev | knowns | < 0.31.0 | 0.31.0 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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uziii2208/CVE-2026-88899 ★ 0 · Sep 14, 2026
Knowns 0.30.0: Unauthenticated Header Injection Grants AI Agent Unrestricted Access to Host Filesystem
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- GitHub Security Advisory (GHSA-9h2q-r9fh-f98w) vendor-advisory
- https://github.com/knowns-dev/knowns/blob/v0.30.0/internal/server/server.go#L1283-L1296 technical-description
- https://github.com/knowns-dev/knowns/commit/37db0561b37b48b8bd035a417d7f1da6258ae657 patch
- knowns v0.31.0 Release Notes release-notes
- VulnCheck Advisory: knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header third-party-advisory