CVE-2026-108839
thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputs
- State
- Published
- Severity
- 2.3 Low
- Published
- Oct 11, 2026
- Updated
- Oct 18, 2026
- Reserved
- Oct 11, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.2 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
thClawsthClaws |
|
References
- https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/thclaws-api-inputs-symlink-escapethird-party-advisory
- https://github.com/thClaws/thClaws/blob/v0.141.0/crates/core/src/api_v1/artifacts.rs#L335-L420technical-description
- https://github.com/thClaws/thClawsproduct
- VulnCheck Advisory: thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputsthird-party-advisory
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