CVE-2026-49846

libks has path traversal in kws HTTP parser via URI segment overflow

State: Published
Severity: 7.5 High
Published: Sep 11, 2026
Updated: Sep 15, 2026
Reserved: Jun 1, 2026

Description

libks provides foundational support for signalwire C products. Prior to version 2.0.11, `clean_uri()` in libks's HTTP request parser fails to reject URIs whose path has more segments than its internal canonicalization buffer can hold. The canonicalization step silently passes such URIs through with embedded ".." sequences intact, enabling path traversal in any consumer that later joins the URI with a filesystem path. Version 2.0.11 patches the issue.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-697 Incorrect Comparison

Affected Products

Product	Versions
libkssignalwire	< 2.0.11Affected

References

https://github.com/signalwire/libks/security/advisories/GHSA-684h-wjm9-2p6j

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