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

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...

Zlib security vulnerabilities

Zlib is a general-purpose data compression library developed by Mark Adler in the United States. Zlib versions 3.0.0 and earlier, as well as versions 3.1.0, 3.1.1, 3.2.0, and 3.2.1, contain security vulnerabilities. These vulnerabilities stem from a buffer overflow in Zlib::GzipReader, which may...

PDF Prototype Pollution

The vulnerability of PDF viewing and editing programs such as Acrobat DC, Acrobat Reader DC, and Acrobat 2024 is related to uncontrolled changes to prototype attributes „Prototype Pollution“. Exploiting this vulnerability can allow an attacker to execute a „Prototype Pollution“ attack...

Linux Distros Unpatched Vulnerability : CVE-2026-27820

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Improper Validation of Specified Quantity in Input

Overview pypdf is an A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files Affected versions of this package are vulnerable to Improper Validation of Specified Quantity in Input through the PdfReader object stream and xref stream parsers in pypdf/reader.py...

Patch Tuesday, April 2026 Edition

Microsoft today pushed software updates to fix a staggering 167 security vulnerabilities in its Windows operating systems and related software, including a SharePoint Server zero-day and a publicly disclosed weakness in Windows Defender dubbed "BlueHammer." Separately, Google Chrome fixed its...

EUVD-2026-22337

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary file system read in the context of the current user. Exploitation of...

EUVD-2026-22335

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of...

CVE-2026-34622

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of...

CVE-2026-34626

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary file system read in the context of the current user. Exploitation of...

CVE-2026-34622 Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of...

CVE-2026-34622

Acrobat Reader is affected by a Prototype Pollution vulnerability (Improperly Controlled Modification of Object Prototype Attributes, CWE-1321). Affected versions include 26.001.21411, 24.001.30360, 24.001.30362 and earlier. The issue could allow arbitrary code execution in the context of the cur...

CVE-2026-34622 Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of...

CVE-2026-34626

Acrobat Reader is affected by CVE-2026-34626: vulnerable versions include 26.001.21411, 24.001.30360, and 24.001.30362 and earlier. The issue is an Improperly Controlled Modification of Object Prototype Attributes (prototype pollution) that could enable arbitrary file system read in the context o...

CVE-2026-34626 Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary file system read in the context of the current user. Exploitation of...

CVE-2026-34626 Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Acrobat Reader versions 26.001.21411, 24.001.30360, 24.001.30362 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes 'Prototype Pollution' vulnerability that could result in arbitrary file system read in the context of the current user. Exploitation of...