Vulnerability-Lookup

CVE-2026-42256 (GCVE-0-2026-42256)

Vulnerability from cvelistv5 – Published: 2026-05-09 19:38 – Updated: 2026-05-11 17:04

Title

net-imap: Denial of service via high iteration count for `SCRAM-*` authentication

Summary

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1322 - Use of Blocking Code in Single-threaded, Non-blocking Context
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/ruby/net-imap/security/advisor…	x_refsource_CONFIRM
https://github.com/ruby/net-imap/commit/158d0b505…	x_refsource_MISC
https://github.com/ruby/net-imap/commit/808001bc4…	x_refsource_MISC
https://github.com/ruby/net-imap/commit/99f59eab6…	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://github.com/ruby/net-imap/releases/tag/v0.6.4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
ruby	net-imap	Affected: >= 0.4.0, < 0.4.24 Affected: >= 0.5.0, < 0.5.14 Affected: >= 0.6.0, < 0.6.4

Show details on NVD website

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To clipboard

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}

WID-SEC-W-2026-2379

Vulnerability from csaf_certbund - Published: 2026-07-15 22:00 - Updated: 2026-07-21 22:00

Summary

Ruby: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Ruby ist eine interpretierte, objektorientierte Skriptsprache.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Ruby ausnutzen, um Informationen offenzulegen, um einen Denial of Service Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

Betroffene Betriebssysteme: - Linux - UNIX - Windows

CVE-2026-41316

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-42245

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-42246

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-42256

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-42257

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-42258

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-47240

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-47241

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

CVE-2026-47242

Affected products

Known affected 5 products

Product	Identifier	Version
Oracle Linux Oracle	`cpe:/o:oracle:linux:-`	—
Open Source Ruby <3.3.12 Open Source / Ruby		<3.3.12
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
IBM License Metric Tool IBM	`cpe:/a:ibm:license_metric_tool:-`	—
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—

References

17 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://www.ruby-lang.org/en/news/2026/07/16/ruby…	external
https://github.com/advisories/GHSA-q2mw-fvj9-vvcw	external
https://github.com/advisories/GHSA-vcgp-9326-pqcp	external
https://github.com/advisories/GHSA-87pf-fpwv-p7m7	external
https://github.com/advisories/GHSA-hm49-wcqc-g2xg	external
https://github.com/advisories/GHSA-75xq-5h9v-w6px	external
https://github.com/advisories/GHSA-8p34-64r3-mwg8	external
https://github.com/advisories/GHSA-c4fp-cxrr-mj66	external
https://github.com/advisories/GHSA-46q3-7gv7-qmgg	external
https://ubuntu.com/security/notices/USN-8556-1	external
http://linux.oracle.com/errata/ELSA-2026-33540.html	external
https://linux.oracle.com/errata/ELSA-2026-20606.html	external
http://linux.oracle.com/errata/ELSA-2026-33565.html	external
https://lists.suse.com/pipermail/sle-security-upd…	external
https://www.ibm.com/support/pages/node/7280602	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Ruby ist eine interpretierte, objektorientierte Skriptsprache.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Ruby ausnutzen, um Informationen offenzulegen, um einen Denial of Service Angriff durchzuf\u00fchren, und um beliebigen Programmcode auszuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-2379 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2379.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-2379 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2379"
      },
      {
        "category": "external",
        "summary": "Ruby Release Notes vom 2026-07-15",
        "url": "https://www.ruby-lang.org/en/news/2026/07/16/ruby-3-3-12-released/"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-q2mw-fvj9-vvcw vom 2026-04-24",
        "url": "https://github.com/advisories/GHSA-q2mw-fvj9-vvcw"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-vcgp-9326-pqcp vom 2026-04-24",
        "url": "https://github.com/advisories/GHSA-vcgp-9326-pqcp"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-87pf-fpwv-p7m7 vom 2026-04-24",
        "url": "https://github.com/advisories/GHSA-87pf-fpwv-p7m7"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-hm49-wcqc-g2xg vom 2026-04-24",
        "url": "https://github.com/advisories/GHSA-hm49-wcqc-g2xg"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-75xq-5h9v-w6px vom 2026-04-24",
        "url": "https://github.com/advisories/GHSA-75xq-5h9v-w6px"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-8p34-64r3-mwg8 vom 2026-06-09",
        "url": "https://github.com/advisories/GHSA-8p34-64r3-mwg8"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-c4fp-cxrr-mj66 vom 2026-06-09",
        "url": "https://github.com/advisories/GHSA-c4fp-cxrr-mj66"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-46q3-7gv7-qmgg vom 2026-06-09",
        "url": "https://github.com/advisories/GHSA-46q3-7gv7-qmgg"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-8556-1 vom 2026-07-16",
        "url": "https://ubuntu.com/security/notices/USN-8556-1"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2026-33540 vom 2026-07-17",
        "url": "http://linux.oracle.com/errata/ELSA-2026-33540.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2026-20606 vom 2026-07-17",
        "url": "https://linux.oracle.com/errata/ELSA-2026-20606.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2026-33565 vom 2026-07-17",
        "url": "http://linux.oracle.com/errata/ELSA-2026-33565.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2026:3090-1 vom 2026-07-17",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-July/027599.html"
      },
      {
        "category": "external",
        "summary": "IBM Security Bulletin 7280602 vom 2026-07-21",
        "url": "https://www.ibm.com/support/pages/node/7280602"
      }
    ],
    "source_lang": "en-US",
    "title": "Ruby: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-07-21T22:00:00.000+00:00",
      "generator": {
        "date": "2026-07-22T09:20:45.129+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-2379",
      "initial_release_date": "2026-07-15T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-07-15T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-07-16T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2026-07-19T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Oracle Linux und SUSE aufgenommen"
        },
        {
          "date": "2026-07-21T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von IBM aufgenommen"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "IBM License Metric Tool",
            "product": {
              "name": "IBM License Metric Tool",
              "product_id": "T029071",
              "product_identification_helper": {
                "cpe": "cpe:/a:ibm:license_metric_tool:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "IBM"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c3.3.12",
                "product": {
                  "name": "Open Source Ruby \u003c3.3.12",
                  "product_id": "T056704"
                }
              },
              {
                "category": "product_version",
                "name": "3.3.12",
                "product": {
                  "name": "Open Source Ruby 3.3.12",
                  "product_id": "T056704-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:ruby-lang:ruby:3.3.12"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Ruby"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Oracle Linux",
            "product": {
              "name": "Oracle Linux",
              "product_id": "T056236",
              "product_identification_helper": {
                "cpe": "cpe:/o:oracle:linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Oracle"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T054646",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T055947",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-41316",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-41316"
    },
    {
      "cve": "CVE-2026-42245",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-42245"
    },
    {
      "cve": "CVE-2026-42246",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-42246"
    },
    {
      "cve": "CVE-2026-42256",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-42256"
    },
    {
      "cve": "CVE-2026-42257",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-42257"
    },
    {
      "cve": "CVE-2026-42258",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-42258"
    },
    {
      "cve": "CVE-2026-47240",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-47240"
    },
    {
      "cve": "CVE-2026-47241",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-47241"
    },
    {
      "cve": "CVE-2026-47242",
      "product_status": {
        "known_affected": [
          "T056236",
          "T056704",
          "T055947",
          "T029071",
          "T054646"
        ]
      },
      "release_date": "2026-07-15T22:00:00.000+00:00",
      "title": "CVE-2026-47242"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-42256 (GCVE-0-2026-42256)

WID-SEC-W-2026-2379

Tags

Sightings

Nomenclature