CVE Catalog

CVE-2026-108839

MediumCVSS 4.2
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.25%

15th percentile - higher than 15% of all known CVEs

Summary

thClaws through 0.141.0 contains a link-following vulnerability in the post_inputs handler of the v1 API POST /v1/inputs endpoint that allows writes outside the workspace by following symlinks. Attackers who plant a symlink under the allowed inputs/ prefix can cause later authenticated uploads to write or truncate files outside the workspace with daemon privileges.

Risk Assessment

The risk is the ability to write or modify files outside the workspace, potentially leading to system integrity compromise or privilege escalation.

Recommendation

It is recommended to update thClaws to a version that protects against symlinks and implement path validation before writing.

Related vulnerabilities

Original NVD description (English source)

thClaws through 0.141.0 contains a link-following vulnerability in the post_inputs handler of the v1 API POST /v1/inputs endpoint that allows writes outside the workspace by following symlinks. Attackers who plant a symlink under the allowed inputs/ prefix can cause later authenticated uploads to write or truncate files outside the workspace with daemon privileges.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS