CVE-2026-42256
6.5 MEDIUMNet::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby
Published: 2026-05-09 · Last updated: 2026-05-18
Severity and scoring
- CVSS
- 6.5 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- CWE
- CWE-1322, CWE-770
Affected products
| Vendor | Product |
|---|---|
| ruby-lang | net\ |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42256
- [Patch]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
- [Other]https://github.com/ruby/net-imap/releases/tag/v0.4.24
- [Other]https://github.com/ruby/net-imap/releases/tag/v0.5.14
- [Other]https://github.com/ruby/net-imap/releases/tag/v0.6.4
- [Vendor advisory]https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
Related CVEs
Same vendor
- CVE-2026-46727 — An issue was discovered in Ruby 4 before 4.0.5 (8.1 HIGH)
- CVE-2026-42258 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (9.8 CRITICAL)
- CVE-2026-42257 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (9.8 CRITICAL)
- CVE-2026-42246 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (7.4 HIGH)
- CVE-2026-42245 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby (7.5 HIGH)
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