6.5

CVE-2026-42256

net-imap: Denial of service via high iteration count for `SCRAM-*` authentication

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Ruby-lang ≫ Net::imap SwPlatformruby Version >= 0.4.0 < 0.4.24
Ruby-lang ≫ Net::imap SwPlatformruby Version >= 0.5.0 < 0.5.14
Ruby-lang ≫ Net::imap SwPlatformruby Version >= 0.6.0 < 0.6.4
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.3% 0.213
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 6.5 2.8 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
security-advisories@github.com 6 0 0
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
CWE-1322 Use of Blocking Code in Single-threaded, Non-blocking Context

The product uses a non-blocking model that relies on a single threaded process for features such as scalability, but it contains code that can block when it is invoked.

CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

https://github.com/ruby/net-imap/releases/tag/v0.4.24
Release Notes
https://github.com/ruby/net-imap/releases/tag/v0.5.14
Release Notes
https://github.com/ruby/net-imap/releases/tag/v0.6.4
Release Notes
https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
Vendor Advisory
Mitigation
https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
Patch
https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
Patch
https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
Patch