USN-8478-1: ruby2.7 Ubuntu

Vulnerability summary

USN-8478-1 is a vulnerability in ruby2.7 Ubuntu with no CVSS score yet.

Timeline

1. 29-06-2025
   PublishedVulnerability first disclosed.
2. 30-06-2026
   Last modifiedVulnerability information updated.

Description

ruby2.7, ruby3.0, ruby3.2, ruby3.3 vulnerabilities It was discovered that Ruby's Net::IMAP library did not properly verify that TLS encryption was started after issuing a STARTTLS command. A remote attacker could use this to perform a machine-in-the-middle attack and silently bypass TLS encryption. (CVE-2026-42246) It was discovered that Ruby's Net::IMAP library did not validate string arguments passed to certain commands. A remote attacker could use this to inject arbitrary IMAP commands. (CVE-2026-42257) It was discovered that Ruby's Net::IMAP library was vulnerable to a denial of service attack when authenticating with SCRAM-SHA1 or SCRAM-SHA256. A hostile server could send a very large iteration count value to cause excessive computation in the client. This issue only affected ruby3.3. (CVE-2026-42256)

No weakness data has been published for this record.