Vulnerability-Lookup

UBUNTU-CVE-2026-47241 (CVE-2026-47241)

Vulnerability from osv_ubuntu – Published: 2026-06-22 21:16 – Updated: 2026-07-16 18:27 – Source website

Details

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.

Severity

2.1 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-47241	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-47241	REPORT
	https://github.com/ruby/net-imap/security/advisor…	REPORT

JSON

To clipboard

{
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      "ecosystem_specific": {
        "binaries": [
          {
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            "binary_version": "1.5.6-9+deb8u2build0.14.04.1~esm2"
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        "purl": "pkg:deb/ubuntu/jruby@1.5.6-9+deb8u2build0.14.04.1~esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
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        "3.3.8-2ubuntu3",
        "3.3.8-2ubuntu3.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a raw string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.",
  "id": "UBUNTU-CVE-2026-47241",
  "modified": "2026-07-16T18:27:47Z",
  "published": "2026-06-22T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47241"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-47241"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-47241"
  ]
}

CVE-2026-47241 (GCVE-0-2026-47241)

Vulnerability from cvelistv5 – Published: 2026-06-22 20:11 – Updated: 2026-06-23 14:16

Title

Net::IMAP: Denial of Service via incomplete raw argument validation

Summary

Severity

2.1 (Low)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 14:16 UTC

CWE

CWE-162 - Improper Neutralization of Trailing Special Elements
CWE-182 - Collapse of Data into Unsafe Value
CWE-186 - Overly Restrictive Regular Expression

Assigner

GitHub_M mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/ruby/net-imap/security/advisor…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ruby	net-imap	Affected: >= 0.6.0, < 0.6.4.1 Affected: < 0.5.15

Show details on NVD website

JSON

To clipboard

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            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-162",
              "description": "CWE-162: Improper Neutralization of Trailing Special Elements",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-182",
              "description": "CWE-182: Collapse of Data into Unsafe Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-186",
              "description": "CWE-186: Overly Restrictive Regular Expression",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-22T20:11:04.329Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-c4fp-cxrr-mj66"
        }
      ],
      "source": {
        "advisory": "GHSA-c4fp-cxrr-mj66",
        "discovery": "UNKNOWN"
      },
      "title": "Net::IMAP: Denial of Service via incomplete raw argument validation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-47241",
    "datePublished": "2026-06-22T20:11:04.329Z",
    "dateReserved": "2026-05-18T22:54:18.272Z",
    "dateUpdated": "2026-06-23T14:16:32.846Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-47241 (CVE-2026-47241)

CVE-2026-47241 (GCVE-0-2026-47241)

Tags

Sightings

Nomenclature

Related by attack behaviour