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ALSA-2025:23062 — Moderate: ruby:3.3 security update

Affected: AlmaLinux:8: ruby, AlmaLinux:8: ruby-bundled-gems, AlmaLinux:8: ruby-default-gems, AlmaLinux:8: ruby-devel, AlmaLinux:8: ruby-doc, AlmaLinux:8: ruby-libs, AlmaLinux:8: rubygem-abrt, AlmaLinux:8: rubygem-abrt-doc, AlmaLinux:8: rubygem-bigdecimal, AlmaLinux:8: rubygem-bundler and 20 more

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es):

* resolv: Denial of Service in resolv gem (CVE-2025-24294) * rexml: REXML denial of service (CVE-2025-58767)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-15238

BELL-CVE-2025-24294

Affected: Alpaquita:23: ruby, Alpaquita:25: ruby, Alpaquita:stream: ruby

certfr-2025-avi-0756 — De multiples vulnérabilités ont été découvertes dans les produits VMware. Elles permettent à un attaquant de provoquer…

certfr-2025-avi-0756

EUVD-2026-247684

fkie_cve-2025-24294

The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet. An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name. This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.

GHSA-xh69-987w-hrp8 — resolv vulnerable to DoS via insufficient DNS domain name length validation

Affected: RubyGems: resolv

A denial of service vulnerability has been discovered in the resolv gem bundled with Ruby.

## Details The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.

An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.

This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.

## Affected Version The vulnerability affects the resolv gem bundled with the following Ruby series: * Ruby 3.2 series: resolv version 0.2.2 and earlier * Ruby 3.3 series: resolv version 0.3.0 * Ruby 3.4 series: resolv version 0.6.1 and earlier

## Credits Thanks to Manu for discovering this issue.

## History Originally published at 2025-07-08 07:00:00 (UTC)

msrc_CVE-2025-24294 — The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the l…

msrc_CVE-2025-24294

OESA-2026-3533 — ruby security update

Affected: openEuler:22.03-LTS-SP4: ruby

Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl). Security Fix(es):

The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.

This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.(CVE-2025-24294)

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.(CVE-2026-27820)

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::I…

RHSA-2025:23062 — Red Hat Security Advisory: ruby:3.3 security update

resolv: Denial of Service in resolv gem rexml: REXML denial of service uri: URI module: Credential exposure via URI + operator

RHSA-2025:23927 — Red Hat Security Advisory: ruby security update

resolv: Denial of Service in resolv gem git-lfs: Git LFS may write to arbitrary files via crafted symlinks rexml: REXML denial of service

SUSE-SU-2025:3776-1 — Security update for ruby2.5

Security update for ruby2.5

UBUNTU-CVE-2025-24294

Affected: Ubuntu:Pro:14.04:LTS: jruby, Ubuntu:Pro:16.04:LTS: ruby2.3, Ubuntu:16.04:LTS: jruby, Ubuntu:Pro:18.04:LTS: ruby2.5, Ubuntu:18.04:LTS: jruby, Ubuntu:Pro:20.04:LTS: ruby2.7, Ubuntu:20.04:LTS: jruby, Ubuntu:22.04:LTS: ruby3.0, Ubuntu:24.04:LTS: jruby, Ubuntu:24.04:LTS: ruby3.2 and 6 more

WID-SEC-W-2025-1472 — Ruby: Schwachstelle ermöglicht Denial of Service

Ein Angreifer kann eine Schwachstelle in Ruby ausnutzen, um einen Denial of Service Angriff durchzuführen.