CVE-2026-107168
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m17n-lib UTF-8 Parsing Infinite Loop DoS

Publication date: 2026-10-07

Last updated on: 2026-10-07

Assigner: redhat-SADP

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.

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Meta Information

Published
2026-10-07
Last Modified
2026-10-07
Generated
2026-10-07
AI Q&A
2026-10-07
EPSS Evaluated
N/A
NVD
CVE-2026-107168
EUVD
EUVD-2026-94313

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-835 The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

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Executive Summary

This vulnerability is in m17n-lib where a crafted input with an invalid UTF-8 character sequence causes the text parsing function to enter an infinite loop. This leads to sustained high CPU usage, resulting in a Denial of Service (DoS) for the affected application.

Detection Guidance

Monitor CPU usage spikes for processes linked to m17n-lib. Check for applications parsing text with UTF-8 input, especially those using count_utf_8_chars(). Look for infinite loops by testing with crafted inputs containing invalid UTF-8 sequences like 0xFF.

Impact Analysis

The vulnerability can cause the affected application to consume nearly 100% CPU until terminated externally, leading to service disruption or system slowdowns. It specifically targets the count_utf_8_chars() function in m17n-lib when processing malformed UTF-8 sequences with lead bytes in the 0xFE-0xFF range.

Compliance Impact

This vulnerability primarily causes a Denial of Service (DoS) by consuming high CPU resources, which may indirectly impact compliance with standards like GDPR or HIPAA by degrading system performance or availability. However, it does not directly lead to data breaches or unauthorized access, so its impact on compliance is likely secondary rather than primary.

Mitigation Strategies

No official mitigation is available per Red Hat. Upgrade to supported versions if available. Avoid processing untrusted text inputs. Restrict access to applications using m17n-lib. Monitor for high CPU usage and terminate suspicious processes.

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