security update for ruby
Description
Multiple security vulnerabilities affecting Ruby 4.0 have been addressed in a security update provided by Red Hat and SUSE. These include memory corruption via buffer overflow in Zlib::GzipReader, arbitrary IMAP command injection through unvalidated input, denial of service via large iteration counts and malformed commands in Net::IMAP, and command injection via non-synchronizing literals. The update rebases Ruby 4.0 to the latest release and includes important security fixes. The vulnerabilities are rated as important/high severity by Red Hat. The update is available for Red Hat Enterprise Linux 9 and related distributions.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This security update addresses several vulnerabilities in Ruby 4.0, including CVE-2026-27820 (memory corruption via buffer overflow in Zlib::GzipReader), CVE-2026-42257 (arbitrary IMAP command injection via CRLF sequences), CVE-2026-42256 (denial of service via large iteration count in SCRAM authentication), CVE-2026-47240 (command injection via non-synchronizing literals), CVE-2026-47241 (denial of service via malformed command input), and CVE-2026-47242 (arbitrary IMAP command injection due to improper input validation). These vulnerabilities affect the Ruby 4.0 module and related gems on Red Hat Enterprise Linux 9 and SUSE. The update rebases Ruby 4.0 to the latest release and fixes these issues. The vendor advisory from Red Hat provides detailed information and instructions for applying the update.
Potential Impact
The vulnerabilities could lead to memory corruption, arbitrary command injection in IMAP processing, and denial of service conditions. These issues could be exploited to compromise system stability or security when processing specially crafted inputs in Ruby applications using the affected components. The severity is rated as important/high by Red Hat, indicating significant security impact if unpatched.
Mitigation Recommendations
A security update is available from Red Hat and SUSE that addresses these vulnerabilities by rebasing Ruby 4.0 to the latest release and applying necessary fixes. Users should apply the update as described in the Red Hat advisory (https://access.redhat.com/errata/RHSA-2026:50827) and SUSE security updates to remediate these issues. No additional mitigations are specified beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:50827
- Cve Count
- 6
- Additional Cves
- ["CVE-2026-42256","CVE-2026-42257","CVE-2026-47240","CVE-2026-47241","CVE-2026-47242"]
- State
- PUBLISHED
Threat ID: 6a9053dcacd9273b4969666b
Added to database: 08/27/2026, 15:12:28 UTC
Last enriched: 09/29/2026, 21:46:09 UTC
Last updated: 10/10/2026, 06:48:15 UTC
Views: 54
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