CVE-2026-54502

Oj Optimized JSON is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fillindent in dump.h calls memsetindentstr, ' ', sizetopts-indent without...

CVE-2026-54500

A flaw was found in Oj Optimized JSON, a Ruby gem. When parsing a specially crafted JSON object with a key 254 bytes or longer using Oj.load in :object mode, an attacker can trigger a read of uninitialized stack memory. This vulnerability, an out-of-bounds read CWE-125, can lead to information...

CVE-2026-54898

A flaw was found in Oj, a Ruby library designed for efficient JSON JavaScript Object Notation parsing. This vulnerability, a heap use-after-free, occurs when a specific function, called a callback, modifies the input JSON string during the parsing process. This action can lead to the program...

CVE-2026-54592

A flaw was found in Oj, a Ruby gem for JSON parsing. A remote attacker can exploit this vulnerability by providing a deeply nested JSON document. This can lead to a stack buffer overflow in the Oj::Doceachchild function, causing the process to abort and resulting in a denial of service DoS for th...

CVE-2026-54903

A flaw was found in Oj, an Optimized JSON JavaScript Object Notation parser for Ruby. This vulnerability allows a remote attacker to cause heap corruption and a denial of service DoS by providing a JSON string larger than 2 gigabytes GB. An integer overflow occurs when processing the string lengt...

CVE-2026-54897

A flaw was found in Oj Optimized JSON, a Ruby gem for parsing JSON. This vulnerability, categorized as a heap use-after-free CWE-416, occurs in the Oj::Doc iterators, specifically eachvalue, eachchild, and eachleaf. An attacker could exploit this when a Ruby code block, executed during iteration,...

RHSA-2026:36099 Red Hat Security Advisory: ruby:3.3 security update

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RHSA-2026:35895 Red Hat Security Advisory: ruby security update

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Important: Red Hat Security Advisory: ruby:3.3 security update

An update for the ruby:3.3 module is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity...

ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses

A flaw was found in Net::IMAP, a Ruby library implementing the Internet Message Access Protocol IMAP client functionality. A hostile server can exploit a quadratic time complexity issue in the Net::IMAP::ResponseReader when processing large responses containing numerous string literals. This can...

OPENSUSE-SU-2026:11204-1 ruby4.0-rubygem-uri-1.1.1-1.1 on GA media

These are all security issues fixed in the ruby4.0-rubygem-uri-1.1.1-1.1 package on the GA media of openSUSE Tumbleweed...

JWT Ruby Authentication DoS

The vulnerability of the JWT Ruby implementation is related to deficiencies in the authentication process. Exploiting this vulnerability could allow an attacker, operating remotely, to cause service failures...

Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransport

Summary An unauthenticated remote attacker can force any MCP Ruby SDK server using MCP::Server::Transports::StreamableHTTPTransport to allocate gigabytes of memory by sending a single oversized JSON-RPC POST. The transport reads the entire HTTP body into a Ruby String and parses it with...

MCP Ruby SDK - Ruby SSE Session Poisoning

Summary Vulnerability: Missing Session Ownership Validation in the Ruby MCP SDK's Streamable and SSE HTTP transport implementation. Any attacker with a stolen session ID can execute tools with the victim's session. This is a silent attack - the victim's session is compromised and being used for...

Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)

Summary The stdio transports in MCP::Server::Transports::StdioTransport and MCP::Client::Stdio read newline-delimited JSON-RPC frames using IOgets with no limit argument. CRuby's IOgets with no limit reads from the current position until the next separator \n with no upper bound on the returned...

RHEL 9 : ruby:3.3 (RHSA-2026:36099)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36099 advisory. Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system...

Important: Red Hat Security Advisory: ruby security update

An update for ruby is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

OESA-2026-2863 vim security update

Vim is an advanced text editor that seeks to provide the power of the de-facto Unix editor 'Vi', with a more complete feature set. Vim is a highly configurable text editor built to enable efficient text editing. It is an improved version of the vi editor distributed with most UNIX systems. Securi...

OESA-2026-2852 rubygem-yard security update

YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions...

OESA-2026-2851 rubygem-yard security update

YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions...