alsa-2026:50827
Vulnerability from osv_almalinux
Published
2026-08-05 00:00
Modified
2026-09-01 08:41
Summary
Important: ruby:4.0 security, bug fix, and enhancement update
Details

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.

Security Fix(es):

  • zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)
  • net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)
  • ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)
  • net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)
  • net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)
  • net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)

Bug Fix(es) and Enhancement(s):

  • ruby:4.0/ruby: Rebase to the latest Ruby 4.0 release [almalinux-9.8.z] (JIRA:AlmaLinux-211301)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "ruby"
      },
      "ranges": [
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            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
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        "ecosystem": "AlmaLinux:9",
        "name": "ruby-bundled-gems"
      },
      "ranges": [
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            }
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      },
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    {
      "package": {
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          "type": "ECOSYSTEM"
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        "name": "rubygem-typeprof"
      },
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          "type": "ECOSYSTEM"
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        "name": "rubygems"
      },
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            }
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          "type": "ECOSYSTEM"
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        "name": "rubygems-devel"
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks.  \n\nSecurity Fix(es):  \n\n  * zlib: zlib: Memory corruption via buffer overflow in Zlib::GzipReader (CVE-2026-27820)\n  * net-imap: Net::IMAP: Arbitrary IMAP command injection via CRLF sequences in unvalidated input (CVE-2026-42257)\n  * ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication (CVE-2026-42256)\n  * net-imap: Net::IMAP: Command injection via non-synchronizing literals (CVE-2026-47240)\n  * net-imap: Net::IMAP: Arbitrary IMAP command injection due to improper input validation (CVE-2026-47242)\n  * net-imap: rubygem-net-imap: Net::IMAP: Denial of Service via malformed command input (CVE-2026-47241)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * ruby:4.0/ruby: Rebase to the latest Ruby 4.0 release [almalinux-9.8.z] (JIRA:AlmaLinux-211301)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:50827",
  "modified": "2026-09-01T08:41:00Z",
  "published": "2026-08-05T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:50827"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-27820"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42256"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42257"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-47240"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-47241"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-47242"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2459002"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2468494"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2468500"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2491519"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2491523"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-50827.html"
    }
  ],
  "related": [
    "CVE-2026-27820",
    "CVE-2026-42257",
    "CVE-2026-42256",
    "CVE-2026-47240",
    "CVE-2026-47242",
    "CVE-2026-47241"
  ],
  "summary": "Important: ruby:4.0 security, bug fix, and enhancement update"
}



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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

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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.