CVE-2026-42256

medium Red Hat
CVSS v3 Base Score
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 85% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Published: May 9, 2026 (61 days ago)
Last Modified: May 9, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in Net::IMAP, a Ruby library for Internet Message Access Protocol (IMAP) client functionality. A hostile server can exploit this vulnerability during SCRAM-SHA1 or SCRAM-SHA256 (Salted Challenge Response Authentication Mechanism - Secure Hash Algorithm 1 or 256) authentication by sending an excessively large iteration count value. This can lead to a computational denial-of-service attack, causing the client process to become unresponsive.

CWE

CWE-606

Affected Products

Red Hat 3scale API Management Platform 2Red Hat Enterprise Linux 10Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9Red Hat Hardened Images

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com