CVE-2026-42256
- Source
- https://cve.org/CVERecord?id=CVE-2026-42256
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42256.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-42256
- Aliases
- Downstream
- Related
- Published
- 2026-05-09T19:38:33.106Z
- Modified
- 2026-07-08T08:13:14.012282061Z
- Severity
-
- 6.0 (Medium) CVSS_V4 - 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 CVSS Calculator
- Summary
- net-imap: Denial of service via high iteration count for `SCRAM-*` authentication
- Details
-
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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42256.json", "cwe_ids": [ "CWE-1322", "CWE-770" ], "cna_assigner": "GitHub_M" }- References
-
- https://github.com/ruby/net-imap/releases/tag/v0.4.24
- https://github.com/ruby/net-imap/releases/tag/v0.5.14
- https://github.com/ruby/net-imap/releases/tag/v0.6.4
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42256.json
- https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
- https://nvd.nist.gov/vuln/detail/CVE-2026-42256
- https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
- https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
- https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
Affected packages
Git / github.com/ruby/net-imap
Affected ranges
- Type
- GIT
- Repo
- https://github.com/ruby/net-imap
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedFixedFixedFixed
- Database specific
{ "source": [ "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:ruby-lang:net\\:\\:imap:*:*:*:*:*:ruby:*:*", "extracted_events": [ { "introduced": "0.4.0" }, { "fixed": "0.4.24" }, { "introduced": "0.5.0" }, { "fixed": "0.5.14" }, { "introduced": "0.6.0" }, { "fixed": "0.6.4" } ] }
Affected versions
v0.*
v0.4.0
v0.4.1
v0.4.10
v0.4.11
v0.4.12
v0.4.13
v0.4.14
v0.4.15
v0.4.16
v0.4.17
v0.4.18
v0.4.19
v0.4.2
v0.4.20
v0.4.21
v0.4.22
v0.4.23
v0.4.3
v0.4.4
v0.4.5
v0.4.6
v0.4.7
v0.4.8
v0.4.9
v0.5.0
v0.5.1
v0.5.10
v0.5.11
v0.5.12
v0.5.13
v0.5.2
v0.5.3
v0.5.4
v0.5.5
v0.5.6
v0.5.7
v0.5.8
v0.5.9
v0.6.0
v0.6.2