ALSA-2026:50773 Important: ruby4.0 security, bug fix, and enhancement update

Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks as in Perl. It is simple, straight-forward, and extensible. Security Fixes: zlib: zlib: Memory corruption via buffer overflow in...

ALSA-2026:50828 Important: ruby:3.3 security, bug fix, and enhancement update

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks. Security Fixes: zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader CVE-2026-27820 net-imap: Net::IMAP: Arbitrary IMAP command...

Important: ruby:3.3 security, bug fix, and enhancement update

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks. Security Fixes: zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader CVE-2026-27820 net-imap: Net::IMAP: Arbitrary IMAP command...

CLSA-2026-1785428387 ruby: Fix of CVE-2026-27820

CVE-2026-27820: zlib: fix buffer overflow in Zlib::GzipReaderungetc by always growing the output buffer before the memmove...

CLSA-2026-1785320518 ruby: Fix of CVE-2026-27820

CVE-2026-27820: zlib: fix buffer overflow in Zlib::GzipReaderungetc by always growing the output buffer before the memmove...

Amazon Linux 2023 : ruby3.4, ruby3.4-bundled-gems, ruby3.4-default-gems (ALAS2023-2026-1807)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1807 advisory. 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...

GHSA-G857-HHFV-J68W Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption

Details A buffer overflow vulnerability exists in Zlib::GzipReader. The zstreambufferungets 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...

CVE-2026-27820

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 zstreambufferungets function prepends caller-provided bytes ahead of previously produced output but...

CVE-2026-27820: Buffer Copy without Checking Size of Input

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 zstreambufferungets function prepends caller-provided bytes ahead of previously produced output but...

CVE-2026-27820: Buffer Copy without Checking Size of Input

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 zstreambufferungets function prepends caller-provided bytes ahead of previously produced output but...