Summary
[4.0.3-35]
- Fix Net::IMAP ResponseReader quadratic complexity vulnerability (CVE-2026-42245)
Includes core fix plus additional performance optimizations
Resolves: RHEL-181675
- Fix Net::IMAP STARTTLS stripping vulnerability (CVE-2026-42246)
Resolves: RHEL-181767
- Fix Net::IMAP command injection vulnerability via unvalidated Symbol arguments (CVE-2026-42258)
Resolves: RHEL-181793
[4.0.3-34]
- Upgrade to Ruby 4.0.3.
Resolves: RHEL-171239
- Fix ERB: Arbitrary code execution via bypass
(CVE-2026-41316)
Resolves: RHEL-170910
- Fix JSON: Denial of Service or Information Disclosure via format string injection
(CVE-2026-33210)
Resolves: RHEL-173457
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| Oracle Linux · 10 | ruby4.0 | 0:4.0.3-35.el10_2 |
| Oracle Linux · 10 | ruby4.0-devel | 0:4.0.3-35.el10_2 |
| Oracle Linux · 10 | ruby4.0-doc | 0:4.0.3-35.el10_2 |
| Oracle Linux · 10 | ruby4.0-rubygem-mysql2 | 0:0.5.7-35.el10_2 |
| Oracle Linux · 10 | ruby4.0-rubygem-pg | 0:1.6.3-35.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…