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.
Affected products
ruby-lang: net\
References7
- github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7 MitigationVendor Advisory
- github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42d… Patch
- github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e… Patch
- github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263a… Patch
- github.com/ruby/net-imap/releases/tag/v0.4.24 Release Notes
- github.com/ruby/net-imap/releases/tag/v0.5.14 Release Notes
- github.com/ruby/net-imap/releases/tag/v0.6.4 Release Notes
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 4.0
-
6.0
MEDIUM
Score source: CNA
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 - EPSS — exploit probability
- 0% percentile: 23 · as of 14 November 2026
- CWE
- CWE-770CWE-1322
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.