Vulnerability-Lookup

OESA-2025-1640 (CVE-2025-43857)

Vulnerability from osv_openeuler – Published: 2025-06-13 11:08 – Updated: 2026-08-06 11:08 – Source website

Summary

ruby security update

Details

Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).

Security Fix(es):

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a "literal" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.(CVE-2025-43857)

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-43857	ADVISORY

JSON

To clipboard

{
  "affected": [
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      "ecosystem_specific": {
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          "ruby-3.0.3-143.oe2203sp3.aarch64.rpm",
          "ruby-debuginfo-3.0.3-143.oe2203sp3.aarch64.rpm",
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          "rubygem-bigdecimal-3.0.0-143.oe2203sp3.aarch64.rpm",
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          "rubygem-openssl-2.2.1-143.oe2203sp3.aarch64.rpm",
          "rubygem-psych-3.3.2-143.oe2203sp3.aarch64.rpm"
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          "rubygem-psych-3.0.2-134.oe2003sp4.x86_64.rpm"
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      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "ruby",
        "purl": "pkg:rpm/openEuler/ruby\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.8-134.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).\r\n\r\nSecurity Fix(es):\n\nNet::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a \u0026quot;literal\u0026quot; byte count, which is automatically read by the client\u0026apos;s receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.(CVE-2025-43857)",
  "id": "OESA-2025-1640",
  "modified": "2026-08-06T11:08:44Z",
  "published": "2025-06-13T11:08:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1640"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-43857"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ruby security update",
  "upstream": [
    "CVE-2025-43857"
  ]
}

CVE-2025-43857 (GCVE-0-2025-43857)

Vulnerability from cvelistv5 – Published: 2025-04-28 16:02 – Updated: 2025-04-28 18:00

Title

net-imap rubygem vulnerable to possible DoS by memory exhaustion

Summary

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 · CISA-ADP (v2.0.3)

Decision recorded 2025-04-28 17:59 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling
CWE-789 - Memory Allocation with Excessive Size Value
CWE-405 - Asymmetric Resource Consumption (Amplification)

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/ruby/net-imap/security/advisor…	x_refsource_CONFIRM
https://github.com/ruby/net-imap/pull/442	x_refsource_MISC
https://github.com/ruby/net-imap/pull/444/commits…	x_refsource_MISC
https://github.com/ruby/net-imap/pull/445	x_refsource_MISC
https://github.com/ruby/net-imap/pull/446	x_refsource_MISC
https://github.com/ruby/net-imap/pull/447	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
ruby	net-imap	Affected: >= 0.5.0, < 0.5.7 Affected: >= 0.4.0, < 0.4.20 Affected: >= 0.3.0, < 0.3.9 Affected: >= 0, < 0.2.5

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{
  "containers": {
    "adp": [
      {
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          {
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                "id": "CVE-2025-43857",
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                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-28T17:59:30.771022Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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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

OESA-2025-1640 (CVE-2025-43857)

CVE-2025-43857 (GCVE-0-2025-43857)

Tags

Sightings

Nomenclature

Related by attack behaviour