Is CVE-2026-42256 actively exploited?

No active exploitation of CVE-2026-42256 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42256 be exploited remotely?

Yes. CVE-2026-42256 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42256?

CVE-2026-42256 has a CVSS score of 6.0 (MEDIUM).

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MEDIUM

CVE-2026-42256

CWE-770Published: May 9, 2026· Updated: May 13, 2026

6.0

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:15.6th

Official Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

NVD Source

Technical Analysis

CVE-2026-42256 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (P) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionP

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X