Heap Buffer Over-read in ugrep LZW Decompressor

Executive Summary

ugrep before 7.6.0 has a heap buffer over-read vulnerability in its LZW decompressor when processing crafted .Z archive files. Attackers can create malformed .Z files that cause the decompressor to read one byte past the allocated heap buffer, potentially crashing the application.

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Detection Guidance

To detect this vulnerability, check the ugrep version installed on your system. Run ugrep --version and verify if it is older than v7.6.0. If so, the system is vulnerable. Additionally, monitor for crashes when processing .Z files, especially with commands like src/ugrep -z x file.Z.

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Impact Analysis

This vulnerability may allow attackers to crash ugrep by providing specially crafted .Z files. If ugrep is used in automated systems or services, crashes could lead to denial of service. Users processing untrusted .Z files may experience application instability.

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Compliance Impact

The vulnerability (CVE-2025-15614) involves a heap buffer over-read in ugrep's LZW decompressor when processing crafted .Z files. While not directly tied to compliance standards like GDPR or HIPAA, such memory corruption flaws could lead to crashes or undefined behavior in systems handling sensitive data. This may indirectly impact compliance by compromising data integrity or availability, though specific regulatory impacts depend on system context and deployment.

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Mitigation Strategies

Immediately update ugrep to version 7.6.0 or later. Download the latest release from the official repository or use your package manager to upgrade. Avoid processing untrusted .Z files until the update is applied.

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