Summary
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.
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 10 | ruby4.0 | 4.0.3-35.el10_2 |
| AlmaLinux · 10 | ruby4.0-devel | 4.0.3-35.el10_2 |
| AlmaLinux · 10 | ruby4.0-doc | 4.0.3-35.el10_2 |
| AlmaLinux · 10 | ruby4.0-rubygem-mysql2 | 0.5.7-35.el10_2 |
| AlmaLinux · 10 | ruby4.0-rubygem-pg | 1.6.3-35.el10_2 |
Vulnerabilities 3
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High 7.6
net-imap vulnerable to STARTTLS stripping via invalid response timing
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issu…
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Medium 5.8
net-imap: Command Injection via unvalidated Symbol inputs
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMA…
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Low 2.3
net-imap: Quadratic complexity when reading response literals
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hos…
References
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report
https://access.redhat.com/security/cve/CVE-2026-42245
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report
https://access.redhat.com/security/cve/CVE-2026-42246
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report
https://access.redhat.com/security/cve/CVE-2026-42258
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report
https://bugzilla.redhat.com/2468495
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report
https://bugzilla.redhat.com/2468498
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report
https://bugzilla.redhat.com/2468499
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advisory
https://errata.almalinux.org/10/ALSA-2026-33540.html