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
- Ruby Net-imap — versions >= 0.5.0, < 0.5.7, >= 0.4.0, < 0.4.20, >= 0.3.0, < 0.3.9
- Ruby-lang Net\ — versions \
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
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.