CVE-2026-41992
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. By decompressing a specially crafted LZW file followed by an LZH file in one gzip -d command, an attacker can poison the shared global state and trigger an out-of-bounds read in the LZH decoder.
Risk Assessment
The risk involves potential remote code execution or sensitive data disclosure by supplying specially crafted files for decompression, which could compromise system confidentiality, integrity, or availability.
Recommendation
It is recommended to immediately update GNU gzip to a version containing commit 63dbf6b3b9e6e781df1a6a64e609b10e23969681 or later, which fixes this vulnerability.
Original NVD description (English source)
GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation. By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out‑of‑bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer. This issue has been fixed in the commit 63dbf6b3b9e6e781df1a6a64e609b10e23969681