CVE-2026-49846 libks has path traversal in kws HTTP parser via URI segment overflow
Attackers can exploit a buffer overflow in the HTTP parser to bypass path restrictions, allowing unauthorized file access or modification in applications using libks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49846?
CVE-2026-49846 is a high-severity path traversal vulnerability in signalwire libks, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-49846?
How do I fix CVE-2026-49846?
No fix has been published for CVE-2026-49846 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-49846 being exploited?
There is no known exploitation of CVE-2026-49846 in the wild and no public exploit code.
Sources
Also known as GHSA-684h-wjm9-2p6j.