Resource exhaustion in Ruby Net-imap

CVE-2025-43857

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server resp…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.004 (35.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-43857?
CVE-2025-43857 is a medium-severity vulnerability in Ruby Net-imap, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2025-04-28.
How severe is CVE-2025-43857?
Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2025-43857 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.