CVE-2026-42258 (GCVE-0-2026-42258)

Vulnerability from cvelistv5 – Published: 2026-05-09 19:40 – Updated: 2026-07-10 12:05
VLAI
Title
net-imap: Command Injection via unvalidated Symbol inputs
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Severity
5.8 (Medium)
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
URL Tags
https://github.com/ruby/net-imap/security/advisor… x_refsource_CONFIRM
https://github.com/ruby/net-imap/releases/tag/v0.4.24 x_refsource_MISC
https://github.com/ruby/net-imap/releases/tag/v0.5.14 x_refsource_MISC
https://github.com/ruby/net-imap/releases/tag/v0.6.4 x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-42258 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2468498 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:37397 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35895 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33565 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33540 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33514 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33515 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35866 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35867 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34076 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35834 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33630 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36099 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33462 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37238 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33512 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33576 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33577 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
ruby net-imap Affected: < 0.4.24
Affected: >= 0.5.0, < 0.5.14
Affected: >= 0.6.0, < 0.6.4
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Red Hat Red Hat Enterprise Linux Server (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux Server Optional (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.4)     cpe:/a:redhat:rhel_aus:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)     cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream AUS (v.8.6)     cpe:/a:redhat:rhel_aus:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)     cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.8.8)     cpe:/a:redhat:rhel_e4s:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream TUS (v.8.8)     cpe:/a:redhat:rhel_tus:8.8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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Red Hat Red Hat 3scale API Management Platform 2     cpe:/a:redhat:red_hat_3scale_amp:2
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}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.