zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption

...

Buffer Overflow

zlib is vulnerable to a buffer overflow. The vulnerability is due to insufficient capacity validation in the zstreambufferungets function of Zlib::GzipReader before shifting existing data with memmove, which allows an attacker to trigger memory corruption by supplying crafted input that causes th...

zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader

A flaw was found in zlib, a Ruby interface for the zlib compression/decompression library. The Zlib::GzipReader component contains a buffer overflow vulnerability. This occurs because the zstreambufferungets function does not ensure sufficient memory capacity before moving existing data, which ca...

CVE-2026-28214

A flaw was found in Firebird, an open-source relational database management system. An authenticated user with INSERT privileges on any table can exploit this vulnerability by sending a specially crafted Batch Parameter Block. This action causes an integer overflow in the...

CVE-2026-28214

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges...

CVE-2026-28214

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges...

CVE-2026-28214

CVE-2026-28214 affects Firebird DBMS. The issue is in the ClumpletReader::getClumpletSize() when parsing a Wide type clumplet, which can overflow totalLength and cause an infinite loop. An authenticated user with INSERT privileges on any table can trigger a denial of service via a crafted Batch P...

PT-2026-33479

Name of the Vulnerable Software and Affected Versions Firebird versions prior to 5.0.4 Firebird versions prior to 4.0.7 Firebird versions prior to 3.0.14 Description The ClumpletReader::getClumpletSize function can overflow the totalLength value when parsing a Wide type clumplet, leading to an...

Linux Distros Unpatched Vulnerability : CVE-2026-28214

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize function can...

CVE-2026-40259 SiYuan: Publish Reader Can Arbitrarily Delete Attribute View Files via removeUnusedAttributeView API

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, the /api/av/removeUnusedAttributeView endpoint is protected only by generic authentication that accepts publish-service RoleReader tokens. The handler passes a caller-controlled id directly to a model...

EUVD-2026-23278

Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption...

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

A flaw was found in zlib, a Ruby interface for the zlib compression/decompression library. The Zlib::GzipReader component contains a buffer overflow vulnerability. This occurs because the zstreambufferungets function does not ensure sufficient memory capacity before moving existing data, which ca...

ALPINE-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

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...

DEBIAN-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

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

CVE-2026-27820 is a buffer overflow in the Ruby zlib interface’s Zlib::GzipReader caused by zstream_buffer_ungets not ensuring sufficient Ruby string capacity before memmove. Affected: zlib gem v3.2.0/3.2.1 and earlier (3.0.0 and below, 3.1.0/3.1.1, 3.2.0/3.2.1). Impact: memory corruption when bu...

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

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...