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

Vulnerability from cvelistv5 – Published: 2026-05-09 19:40 – Updated: 2026-06-30 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
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 AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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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 Hardened Images     cpe:/a:redhat:hummingbird:1
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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 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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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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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 Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"net-imap: Command Injection via unvalidated Symbol inputs\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-77\", \"lang\": \"en\", \"description\": \"CWE-77: Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)\", \"type\": \"CWE\"}]}, {\"descriptions\": [{\"cweId\": \"CWE-93\", \"lang\": \"en\", \"description\": \"CWE-93: Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV4_0\": {\"attackVector\": \"LOCAL\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"PASSIVE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"baseScore\": 5.8, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"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\", \"version\": \"4.0\"}}], \"references\": [{\"name\": \"https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px\"}, {\"name\": \"https://github.com/ruby/net-imap/releases/tag/v0.4.24\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/ruby/net-imap/releases/tag/v0.4.24\"}, {\"name\": \"https://github.com/ruby/net-imap/releases/tag/v0.5.14\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/ruby/net-imap/releases/tag/v0.5.14\"}, {\"name\": \"https://github.com/ruby/net-imap/releases/tag/v0.6.4\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/ruby/net-imap/releases/tag/v0.6.4\"}], \"affected\": [{\"vendor\": \"ruby\", \"product\": \"net-imap\", \"versions\": [{\"version\": \"\u003c 0.4.24\", \"status\": \"affected\"}, {\"version\": \"\u003e= 0.5.0, \u003c 0.5.14\", \"status\": \"affected\"}, {\"version\": \"\u003e= 0.6.0, \u003c 0.6.4\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-05-09T19:40:49.405Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"source\": {\"advisory\": \"GHSA-75xq-5h9v-w6px\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42258\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-11T14:57:16.635329Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-11T14:57:20.913Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42258\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-04-26T11:53:27.704Z\", \"datePublished\": \"2026-05-09T19:40:49.405Z\", \"dateUpdated\": \"2026-05-11T14:57:24.039Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.