Security Advisory

CVE-2026-27820

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-16 17:27:48

Last updated 2026-04-16 18:20:21

Assigner GitHub_M

State PUBLISHED

Description

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.

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