Vulnerability Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Starting in version 0.3.2 and prior to versions 0.3.8, 0.4.19, and 0.5.6, there is a possibility for denial of service by memory exhaustion in `net-imap`'s response parser. At any time while the client is connected, a malicious server can send can send highly compressed `uid-set` data which is automatically read by the client's receiver thread. The response parser uses `Range#to_a` to convert the `uid-set` data into arrays of integers, with no limitation on the expanded size of the ranges. Versions 0.3.8, 0.4.19, 0.5.6, and higher fix this issue. Additional details for proper configuration of fixed versions and backward compatibility are available in the GitHub Security Advisory.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/ruby/net-imap/commit/70e3ddd071a94e450b3238570af482c296380b35
- https://github.com/ruby/net-imap/commit/c8c5a643739d2669f0c9a6bb9770d0c045fd74a3
- https://github.com/ruby/net-imap/commit/cb92191b1ddce2d978d01b56a0883b6ecf0b1022
- https://github.com/ruby/net-imap/security/advisories/GHSA-7fc5-f82f-cx69
FAQ
What is CVE-2025-25186?
CVE-2025-25186 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Starting in version 0.3.2 and prior to versions 0.3.8, 0.4.19, and 0.5.6, there is a possibility for denial o...
How severe is CVE-2025-25186?
CVE-2025-25186 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-25186?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.