CVE-2026-107168 M17n-lib: parser infinite loop on malformed utf-8 in count_utf_8_chars()
An attacker can cause a denial of service in applications using M17n-lib by providing malformed UTF-8 input that triggers an infinite loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107168?
CVE-2026-107168 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 7 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in m17n-lib. By providing crafted input containing an invalid UTF-8 character sequence, an attacker can cause the text parsing function to enter an infinite loop. This issue leads to sustained high CPU utilization, resulting in a Denial of Service (DoS) for the affected application.
Weakness: CWE-835
Which versions are affected by CVE-2026-107168?
How do I fix CVE-2026-107168?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-107168 being exploited?
There is no known exploitation of CVE-2026-107168 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107168, GHSA-rgch-6vg6-rm4p, UBUNTU-CVE-2026-107168.