Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
This update includes the following RPMs: ruby3.4: * ruby3.4-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-bundled-gems-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-default-gems-3.4.10-31.hum1 (noarch) * ruby3.4-devel-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-doc-3.4.10-31.hum1 (noarch) * ruby3.4-libs-3.4.10-31.hum1 (aarch64, x86_64) * rubygem3.4-bigdecimal-3.1.8-31.hum1 (aarch64, x86_64) * rubygem3.4-bundler-2.6.9-31.hum1 (noarch) * rubygem3.4-devel-3.6.9-31.hum1 (noarch) * rubygem3.4-io-console-0.8.1-31.hum1 (aarch64, x86_64) * rubygem3.4-irb-1.14.3-31.hum1 (noarch) * rubygem3.4-json-2.9.1-31.hum1 (aarch64, x86_64) * rubygem3.4-minitest-5.25.4-31.hum1 (noarch) * rubygem3.4-power_assert-2.0.5-31.hum1 (noarch) * rubygem3.4-psych-5.2.2-31.hum1 (aarch64, x86_64) * rubygem3.4-racc-1.8.1-31.hum1 (aarch64, x86_64) * rubygem3.4-rake-13.2.1-31.hum1 (noarch) * rubygem3.4-rbs-3.8.0-31.hum1 (aarch64, x86_64) * rubygem3.4-rdoc-6.14.0-31.hum1 (noarch) * rubygem3.4-rexml-3.4.4-31.hum1 (noarch) * rubygem3.4-rss-0.3.1-31.hum1 (noarch) * rubygem3.4-rubygems-3.6.9-31.hum1 (noarch) * rubygem3.4-test-unit-3.6.7-31.hum1 (noarch) * rubygem3.4-typeprof-0.30.1-31.hum1 (noarch) * ruby3.4-3.4.10-31.hum1.src (src) Security Fix(es): ruby3.4: * CVE-2026-42245 * CVE-2026-42246 * CVE-2026-42256 * CVE-2026-47242
AI Analysis
Technical Summary
CVE-2026-42245 is a denial of service vulnerability in the Ruby Net::IMAP library, specifically in the Net::IMAP::ResponseReader component. A malicious IMAP server can exploit a quadratic time complexity flaw when processing large responses containing many string literals, leading to excessive CPU usage and exhaustion on the client side. The vulnerability impacts Red Hat Hardened Images RPMs including ruby3.4 and related gems. Red Hat has issued security updates for these packages to fix the issue. Exploitation requires interaction with a hostile IMAP server, and the impact is limited to resource exhaustion of the client process without further compromise.
Potential Impact
Successful exploitation causes denial of service by exhausting CPU resources of the client application using the vulnerable Net::IMAP library. There is no impact on confidentiality, integrity, or privilege escalation. The vulnerability affects availability of the client process only and requires connection to a hostile IMAP server.
Mitigation Recommendations
Red Hat has released updated RPM packages (ruby3.4-3.4.10-31.hum1 and related gems) that fix this vulnerability. Users should apply these updates to remediate the issue. Additionally, applications using the Net::IMAP library should be configured to connect only to trusted IMAP servers to reduce exposure to malicious servers that could exploit this flaw.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Description
This update includes the following RPMs: ruby3.4: * ruby3.4-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-bundled-gems-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-default-gems-3.4.10-31.hum1 (noarch) * ruby3.4-devel-3.4.10-31.hum1 (aarch64, x86_64) * ruby3.4-doc-3.4.10-31.hum1 (noarch) * ruby3.4-libs-3.4.10-31.hum1 (aarch64, x86_64) * rubygem3.4-bigdecimal-3.1.8-31.hum1 (aarch64, x86_64) * rubygem3.4-bundler-2.6.9-31.hum1 (noarch) * rubygem3.4-devel-3.6.9-31.hum1 (noarch) * rubygem3.4-io-console-0.8.1-31.hum1 (aarch64, x86_64) * rubygem3.4-irb-1.14.3-31.hum1 (noarch) * rubygem3.4-json-2.9.1-31.hum1 (aarch64, x86_64) * rubygem3.4-minitest-5.25.4-31.hum1 (noarch) * rubygem3.4-power_assert-2.0.5-31.hum1 (noarch) * rubygem3.4-psych-5.2.2-31.hum1 (aarch64, x86_64) * rubygem3.4-racc-1.8.1-31.hum1 (aarch64, x86_64) * rubygem3.4-rake-13.2.1-31.hum1 (noarch) * rubygem3.4-rbs-3.8.0-31.hum1 (aarch64, x86_64) * rubygem3.4-rdoc-6.14.0-31.hum1 (noarch) * rubygem3.4-rexml-3.4.4-31.hum1 (noarch) * rubygem3.4-rss-0.3.1-31.hum1 (noarch) * rubygem3.4-rubygems-3.6.9-31.hum1 (noarch) * rubygem3.4-test-unit-3.6.7-31.hum1 (noarch) * rubygem3.4-typeprof-0.30.1-31.hum1 (noarch) * ruby3.4-3.4.10-31.hum1.src (src) Security Fix(es): ruby3.4: * CVE-2026-42245 * CVE-2026-42246 * CVE-2026-42256 * CVE-2026-47242
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42245 is a denial of service vulnerability in the Ruby Net::IMAP library, specifically in the Net::IMAP::ResponseReader component. A malicious IMAP server can exploit a quadratic time complexity flaw when processing large responses containing many string literals, leading to excessive CPU usage and exhaustion on the client side. The vulnerability impacts Red Hat Hardened Images RPMs including ruby3.4 and related gems. Red Hat has issued security updates for these packages to fix the issue. Exploitation requires interaction with a hostile IMAP server, and the impact is limited to resource exhaustion of the client process without further compromise.
Potential Impact
Successful exploitation causes denial of service by exhausting CPU resources of the client application using the vulnerable Net::IMAP library. There is no impact on confidentiality, integrity, or privilege escalation. The vulnerability affects availability of the client process only and requires connection to a hostile IMAP server.
Mitigation Recommendations
Red Hat has released updated RPM packages (ruby3.4-3.4.10-31.hum1 and related gems) that fix this vulnerability. Users should apply these updates to remediate the issue. Additionally, applications using the Net::IMAP library should be configured to connect only to trusted IMAP servers to reduce exposure to malicious servers that could exploit this flaw.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:33515
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-42246","CVE-2026-42258"]
- State
- PUBLISHED
Threat ID: 6a4452de27e9c797198e0963
Added to database: 06/30/2026, 23:35:58 UTC
Last enriched: 08/16/2026, 17:45:07 UTC
Last updated: 09/29/2026, 18:11:18 UTC
Views: 106
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