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Vulnerability · Published Oct 7, 2026 · Assigned by redhat

CVE-2026-107168M17n-lib: parser infinite loop on malformed utf-8 in count_utf_8_chars()

Medium 6.2

In plain English

A medium-severity infinite loop in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.2Medium
Exploit odds (30 days)0.1%top 98.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12m17n-libno fix listedDEBIAN-CVE-2026-107168
Debian:13m17n-libno fix listedDEBIAN-CVE-2026-107168
Debian:14m17n-lib1.8.7-1DEBIAN-CVE-2026-107168
Ubuntu:22.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-107168
Ubuntu:24.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-107168
Ubuntu:26.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-107168
Ubuntu:26.10m17n-libno fix listedUBUNTU-CVE-2026-107168

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-835 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References