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RHSA-2026:34293

Vulnerability from csaf_redhat - Published: 2026-07-01 13:59 - Updated: 2026-08-27 13:03
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: ruby3.4: * ruby3.4-3.4.8-31.3.hum1 (aarch64, x86_64) * ruby3.4-bundled-gems-3.4.8-31.3.hum1 (aarch64, x86_64) * ruby3.4-default-gems-3.4.8-31.3.hum1 (noarch) * ruby3.4-devel-3.4.8-31.3.hum1 (aarch64, x86_64) * ruby3.4-doc-3.4.8-31.3.hum1 (noarch) * ruby3.4-libs-3.4.8-31.3.hum1 (aarch64, x86_64) * rubygem3.4-bigdecimal-3.1.8-31.3.hum1 (aarch64, x86_64) * rubygem3.4-bundler-2.6.9-31.3.hum1 (noarch) * rubygem3.4-devel-3.6.9-31.3.hum1 (noarch) * rubygem3.4-io-console-0.8.1-31.3.hum1 (aarch64, x86_64) * rubygem3.4-irb-1.14.3-31.3.hum1 (noarch) * rubygem3.4-json-2.9.1-31.3.hum1 (aarch64, x86_64) * rubygem3.4-minitest-5.25.4-31.3.hum1 (noarch) * rubygem3.4-power_assert-2.0.5-31.3.hum1 (noarch) * rubygem3.4-psych-5.2.2-31.3.hum1 (aarch64, x86_64) * rubygem3.4-racc-1.8.1-31.3.hum1 (aarch64, x86_64) * rubygem3.4-rake-13.2.1-31.3.hum1 (noarch) * rubygem3.4-rbs-3.8.0-31.3.hum1 (aarch64, x86_64) * rubygem3.4-rdoc-6.14.0-31.3.hum1 (noarch) * rubygem3.4-rexml-3.4.4-31.3.hum1 (noarch) * rubygem3.4-rss-0.3.1-31.3.hum1 (noarch) * rubygem3.4-rubygems-3.6.9-31.3.hum1 (noarch) * rubygem3.4-test-unit-3.6.7-31.3.hum1 (noarch) * rubygem3.4-typeprof-0.30.1-31.3.hum1 (noarch) * ruby3.4-3.4.8-31.3.hum1.src (src) Security Fix(es): ruby3.4: * CVE-2026-47242
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

A flaw was found in Net::IMAP, a Ruby client library for the Internet Message Access Protocol (IMAP). This vulnerability allows a remote attacker to cause a denial of service by sending specially crafted input to certain Net::IMAP commands. When a raw string argument, derived from user-controlled input, is not properly validated, it can force subsequent commands to be absorbed, leading to a hung connection and preventing further processing until the connection is closed.

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@aarch64
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@noarch
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@src
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@x86_64
Vendor Fix fix
Workaround
Threats
Impact Moderate

A flaw was found in Net::IMAP, a Ruby library that implements Internet Message Access Protocol (IMAP) client functionality. This vulnerability arises from improper input validation when handling ID field values and arguments to the `enable` command. A remote attacker could exploit this by injecting specially crafted input, leading to the execution of arbitrary IMAP commands. This could allow an attacker to manipulate IMAP sessions or access sensitive information.

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@aarch64
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@noarch
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@src
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:ruby3-4-main@x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

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      "cve": "CVE-2026-47241",
      "cwe": {
        "id": "CWE-88",
        "name": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)"
      },
      "discovery_date": "2026-06-22T21:01:13.810999+00:00",
      "ids": [
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          "text": "2491523"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Net::IMAP, a Ruby client library for the Internet Message Access Protocol (IMAP). This vulnerability allows a remote attacker to cause a denial of service by sending specially crafted input to certain Net::IMAP commands. When a raw string argument, derived from user-controlled input, is not properly validated, it can force subsequent commands to be absorbed, leading to a hung connection and preventing further processing until the connection is closed.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A Moderate denial of service flaw was found in the Net::IMAP Ruby client library. This issue occurs when a remote attacker sends specially crafted input to certain Net::IMAP commands, causing the client connection to hang indefinitely. This can prevent further processing of IMAP commands until the connection is manually closed, impacting the availability of services relying on the Net::IMAP client.",
          "title": "Statement"
        },
        {
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        }
      ],
      "product_status": {
        "fixed": [
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          "Red Hat Hardened Images:ruby3-4-main@noarch",
          "Red Hat Hardened Images:ruby3-4-main@src",
          "Red Hat Hardened Images:ruby3-4-main@x86_64"
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      },
      "references": [
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-47241"
        },
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          "category": "external",
          "summary": "RHBZ#2491523",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491523"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-47241",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-47241"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47241",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47241"
        },
        {
          "category": "external",
          "summary": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66",
          "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66"
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      "remediations": [
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          "date": "2026-07-01T13:59:55+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:ruby3-4-main@aarch64",
            "Red Hat Hardened Images:ruby3-4-main@noarch",
            "Red Hat Hardened Images:ruby3-4-main@src",
            "Red Hat Hardened Images:ruby3-4-main@x86_64"
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          "url": "https://access.redhat.com/errata/RHSA-2026:34293"
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          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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            "Red Hat Hardened Images:ruby3-4-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:ruby3-4-main@noarch",
            "Red Hat Hardened Images:ruby3-4-main@src",
            "Red Hat Hardened Images:ruby3-4-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input"
    },
    {
      "cve": "CVE-2026-47242",
      "cwe": {
        "id": "CWE-78",
        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
      },
      "discovery_date": "2026-06-22T21:01:10.532327+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2491522"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Net::IMAP, a Ruby library that implements Internet Message Access Protocol (IMAP) client functionality. This vulnerability arises from improper input validation when handling ID field values and arguments to the `enable` command. A remote attacker could exploit this by injecting specially crafted input, leading to the execution of arbitrary IMAP commands. This could allow an attacker to manipulate IMAP sessions or access sensitive information.",
          "title": "Vulnerability description"
        },
        {
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          "text": "net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw in the Net::IMAP Ruby library, which could allow a remote attacker to inject arbitrary IMAP commands. This is due to improper input validation when handling ID field values and arguments to the `enable` command. Successful exploitation requires user interaction, but could lead to manipulation of IMAP sessions or access to sensitive data.",
          "title": "Statement"
        },
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:ruby3-4-main@aarch64",
          "Red Hat Hardened Images:ruby3-4-main@noarch",
          "Red Hat Hardened Images:ruby3-4-main@src",
          "Red Hat Hardened Images:ruby3-4-main@x86_64"
        ]
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-47242"
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          "category": "external",
          "summary": "RHBZ#2491522",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491522"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-47242",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-47242"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47242",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47242"
        },
        {
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          "summary": "https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg",
          "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg"
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      "release_date": "2026-06-22T20:19:41.222000+00:00",
      "remediations": [
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          "date": "2026-07-01T13:59:55+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:ruby3-4-main@aarch64",
            "Red Hat Hardened Images:ruby3-4-main@noarch",
            "Red Hat Hardened Images:ruby3-4-main@src",
            "Red Hat Hardened Images:ruby3-4-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34293"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Update to the fixed version of affected product.",
          "product_ids": [
            "Red Hat Hardened Images:ruby3-4-main@aarch64",
            "Red Hat Hardened Images:ruby3-4-main@noarch",
            "Red Hat Hardened Images:ruby3-4-main@src",
            "Red Hat Hardened Images:ruby3-4-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:ruby3-4-main@aarch64",
            "Red Hat Hardened Images:ruby3-4-main@noarch",
            "Red Hat Hardened Images:ruby3-4-main@src",
            "Red Hat Hardened Images:ruby3-4-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation"
    }
  ]
}



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Taxonomy of the tags.


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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.

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Detection rules are retrieved from Rulezet.

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