knowns-dev knowns up to 0.30.x Proxy Endpoint /api/opencode x-opencode-directory path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in knowns-dev knowns up to 0.30.x. The impacted element is an unknown function of the file /api/opencode of the component Proxy Endpoint. Performing a manipulation of the argument x-opencode-directory results in path traversal. This vulnerability was named CVE-2026-88899. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in knowns-dev knowns up to 0.30.x. This affects an unknown functionality of the file /api/opencode of the component Proxy Endpoint. The manipulation of the argument x-opencode-directory with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-88899 since 09/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 0.31.0 eliminates this vulnerability.

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Productinfo

Vendor

• knowns-dev

Name

• knowns

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30

Website

• Product: https://github.com/knowns-dev/knowns/

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