CVE-2026-42256
medium
CVSS v3
6.5
CVSS v4 NEW
6.0
VIR risk
6.5
Description
net-imap vulnerable to denial of service via high iteration count for `SCRAM-*` authentication
Predictions
Exploit likelihood
75%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Affected 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Affected | — |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Windows Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | net-imap | !< 0.4.0||<~> 0.4.24 | ~> 0.4.24 |
| RubyGems | net-imap | >=0.6.0,<0.6.4 | 0.6.4 |
| RubyGems | net-imap | >=0.5.0,<0.5.14 | 0.5.14 |
| RubyGems | net-imap | >=0.4.0,<0.4.24 | 0.4.24 |
| RUBYGEMS | net-imap | >= 0.4.0, <= 0.4.23 | 0.4.24 |
| RUBYGEMS | net-imap | >= 0.5.0, <= 0.5.13 | 0.5.14 |
| RUBYGEMS | net-imap | >= 0.6.0, <= 0.6.3 | 0.6.4 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| ruby-lang | net\ | {"startIncluding":"0.4.0","endExcluding":"0.4.24"} | 0.4.24 |
References
- https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
- https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
- https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
- https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
- 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://www.suse.com/security/cve/CVE-2026-42256.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-42256
- https://github.com/ruby/net-imap
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml
- https://www.rfc-editor.org/rfc/rfc7804.html#page-15
- https://security-tracker.debian.org/tracker/CVE-2026-42256
- https://github.com/advisories/GHSA-87pf-fpwv-p7m7
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42256
CWEs
CWE-770 CWE-1322
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.