CVE-2026-42246 (GCVE-0-2026-42246)

Vulnerability from cvelistv5 – Published: 2026-05-09 19:33 – Updated: 2026-08-05 12:14
VLAI
Title
net-imap vulnerable to STARTTLS stripping via invalid response timing
Summary
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 02:29 UTC
CWE
  • CWE-392 - Missing Report of Error Condition
  • CWE-393 - Return of Wrong Status Code
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
  • CWE-636 - Not Failing Securely ('Failing Open')
  • CWE-841 - Improper Enforcement of Behavioral Workflow
  • CWE-325 - Missing Cryptographic Step
Assigner
References
URL Tags
https://github.com/ruby/net-imap/security/advisor… x_refsource_CONFIRM
https://github.com/ruby/net-imap/commit/0ede4c40b… x_refsource_MISC
https://github.com/ruby/net-imap/commit/24a4e770b… x_refsource_MISC
https://github.com/ruby/net-imap/commit/97e2488fb… x_refsource_MISC
https://github.com/ruby/net-imap/commit/f79d35bf5… x_refsource_MISC
https://github.com/ruby/net-imap/releases/tag/v0.3.10 x_refsource_MISC
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://access.redhat.com/security/cve/CVE-2026-42246 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2468499 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
https://access.redhat.com/errata/RHSA-2026:33721 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33552 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33551 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
ruby net-imap Affected: < 0.3.10
Affected: >= 0.4.0, < 0.4.24
Affected: >= 0.5.0, < 0.5.14
Affected: >= 0.6.0, < 0.6.4
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:4.0.3-35.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.3.10-13.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:3.3.10-11.el10_0.2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:2.0.0.648-39.el7_9.1 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260615131019.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260615131010.489197e6 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260630124058.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020260630124058.522a0ee4 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260630123825.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 8060020260630123825.ad008a3a , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260625114827.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260625114827.63b34585 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.0.7-167.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260615131001.9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 9080020260619130154.9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:3.0.4-161.el9_2.3 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:3.0.7-162.el9_4.3 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 9040020260630065449.9 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:3.0.7-165.el9_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 9060020260630075016.9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Hardened Images Unaffected: 4.0.0-33.4.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Hardened Images Unaffected: 3.4.10-31.hum1 , < * (rpm)
Unaffected: 3.4.8-31.2.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Hardened Images Unaffected: 3.3.10-23.2.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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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 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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      "product_status:fixed": "1917",
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      "product_status:known_not_affected": "10",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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As a result, the connection may continue to transmit sensitive information in cleartext and enable modification of data exchanged over the affected connection, while the application incorrectly believes that encryption has been enabled.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-325\", \"description\": \"Missing Cryptographic Step\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-08-05T12:14:46.068Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42246\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-12T02:29:05.120225Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-12T02:29:10.449Z\"}}], \"cna\": {\"title\": \"net-imap vulnerable to STARTTLS stripping via invalid response timing\", \"source\": {\"advisory\": \"GHSA-vcgp-9326-pqcp\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 7.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"ruby\", \"product\": \"net-imap\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 0.3.10\"}, {\"status\": \"affected\", \"version\": \"\u003e= 0.4.0, \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\"}]}], \"references\": [{\"url\": \"https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp\", \"name\": \"https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618\", \"name\": \"https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e\", \"name\": \"https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c\", \"name\": \"https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da\", \"name\": \"https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ruby/net-imap/releases/tag/v0.3.10\", \"name\": \"https://github.com/ruby/net-imap/releases/tag/v0.3.10\", \"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/v0.4.24\", \"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/v0.5.14\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return \\\"successfully\\\", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-392\", \"description\": \"CWE-392: Missing Report of Error Condition\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-393\", \"description\": \"CWE-393: Return of Wrong Status Code\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754: Improper Check for Unusual or Exceptional Conditions\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-636\", \"description\": \"CWE-636: Not Failing Securely (\u0027Failing Open\u0027)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-841\", \"description\": \"CWE-841: Improper Enforcement of Behavioral Workflow\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-05-09T19:33:17.880Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42246\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:14:46.068Z\", \"dateReserved\": \"2026-04-25T05:37:12.118Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-05-09T19:33:17.880Z\", \"assignerShortName\": \"GitHub_M\"}",
      "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.