Red Hat Security Advisory: ruby4.0 security update
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible. Security Fix(es): * ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses (CVE-2026-42245) * ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments (CVE-2026-42258) * net-imap: ruby: Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS (CVE-2026-42246) 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.
AI Analysis
Technical Summary
This advisory covers three security vulnerabilities in the ruby4.0 Net::IMAP library: CVE-2026-42245 (Denial of Service via crafted IMAP responses), CVE-2026-42258 (IMAP Command Injection via Symbol Arguments), and CVE-2026-42246 (Information disclosure via man-in-the-middle attack bypassing TLS). These vulnerabilities could allow attackers to disrupt IMAP services, inject commands, or intercept sensitive information by bypassing TLS protections. The issues affect multiple Red Hat Enterprise Linux 10 variants and CodeReady Linux Builder 10 versions. Red Hat has released updated ruby4.0 packages to address these flaws.
Potential Impact
The vulnerabilities could lead to denial of service conditions, unauthorized command execution within the IMAP protocol context, and exposure of sensitive information through man-in-the-middle attacks that bypass TLS encryption. These impacts could affect applications and systems relying on ruby4.0's Net::IMAP functionality, potentially disrupting email-related services and exposing confidential data.
Mitigation Recommendations
Red Hat has released updated ruby4.0 packages for Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products that fix these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the provided patches.
Red Hat Security Advisory: ruby4.0 security update
Description
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible. Security Fix(es): * ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses (CVE-2026-42245) * ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments (CVE-2026-42258) * net-imap: ruby: Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS (CVE-2026-42246) 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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers three security vulnerabilities in the ruby4.0 Net::IMAP library: CVE-2026-42245 (Denial of Service via crafted IMAP responses), CVE-2026-42258 (IMAP Command Injection via Symbol Arguments), and CVE-2026-42246 (Information disclosure via man-in-the-middle attack bypassing TLS). These vulnerabilities could allow attackers to disrupt IMAP services, inject commands, or intercept sensitive information by bypassing TLS protections. The issues affect multiple Red Hat Enterprise Linux 10 variants and CodeReady Linux Builder 10 versions. Red Hat has released updated ruby4.0 packages to address these flaws.
Potential Impact
The vulnerabilities could lead to denial of service conditions, unauthorized command execution within the IMAP protocol context, and exposure of sensitive information through man-in-the-middle attacks that bypass TLS encryption. These impacts could affect applications and systems relying on ruby4.0's Net::IMAP functionality, potentially disrupting email-related services and exposing confidential data.
Mitigation Recommendations
Red Hat has released updated ruby4.0 packages for Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products that fix these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the provided patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:33540
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-42246","CVE-2026-42258"]
- State
- PUBLISHED
Threat ID: 6a4452de27e9c797198e095b
Added to database: 06/30/2026, 23:35:58 UTC
Last enriched: 08/17/2026, 19:07:05 UTC
Last updated: 09/29/2026, 18:11:18 UTC
Views: 151
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