Vulnerability-Lookup

UBUNTU-CVE-2026-110869 (CVE-2026-110869)

Vulnerability from osv_ubuntu – Published: 2026-10-15 00:00 – Updated: 2026-10-15 00:00 – Source website

Details

Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.

Severity

7.5 (High)


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

8.7 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-110869	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-110869	REPORT
	https://github.com/nodemailer/nodemailer/security…	REPORT
	https://www.vulncheck.com/advisories/nodemailer-3…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-nodemailer",
            "binary_version": "6.4.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "node-nodemailer",
        "purl": "pkg:deb/ubuntu/node-nodemailer@6.4.5-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.3.0-2",
        "6.3.1-1",
        "6.4.0-1",
        "6.4.1-1",
        "6.4.2-1",
        "6.4.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-nodemailer",
            "binary_version": "6.7.1+~6.4.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-nodemailer",
        "purl": "pkg:deb/ubuntu/node-nodemailer@6.7.1+~6.4.4-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.4.17-3",
        "6.7.0-1",
        "6.7.0-2",
        "6.7.1+~6.4.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-nodemailer",
            "binary_version": "6.9.4+~6.4.9-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-nodemailer",
        "purl": "pkg:deb/ubuntu/node-nodemailer@6.9.4+~6.4.9-4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.9.4+~6.4.9-2",
        "6.9.4+~6.4.9-3ubuntu1",
        "6.9.4+~6.4.9-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-nodemailer",
            "binary_version": "9.0.5+~8.0.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "node-nodemailer",
        "purl": "pkg:deb/ubuntu/node-nodemailer@9.0.5+~8.0.1-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.0.4+~7.0.11-1",
        "8.0.4+~7.0.11-2",
        "9.0.0+~8.0.1-1",
        "9.0.3+~8.0.1-1",
        "9.0.5+~8.0.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-nodemailer",
            "binary_version": "8.0.4+~7.0.11-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-nodemailer",
        "purl": "pkg:deb/ubuntu/node-nodemailer@8.0.4+~7.0.11-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.0.5+~7.0.1-1",
        "7.0.9+~7.0.2-2",
        "7.0.10+~7.0.2-1",
        "7.0.12+~7.0.5-1",
        "8.0.4+~7.0.11-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.",
  "id": "UBUNTU-CVE-2026-110869",
  "modified": "2026-10-15T00:00:00Z",
  "published": "2026-10-15T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-110869"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-110869"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4ffr-jq9g-5ffx"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.13-redos-via-smtp-auth-mechanism-detection-regexes"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-110869"
  ]
}

CVE-2026-110869 (GCVE-0-2026-110869)

Vulnerability from cvelistv5 – Published: 2026-10-14 22:52 – Updated: 2026-10-15 15:35

Title

Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes

Summary

Severity

8.7 (High)


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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 15:35 UTC

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6430 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/nodemailer/nodemailer/security…	vendor-advisory
https://www.vulncheck.com/advisories/nodemailer-3…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
nodemailer	nodemailer	Affected: 3.0.0 , < 10.0.13 (semver) Unaffected: 10.0.13 (semver) cpe:2.3:a:nodemailer:nodemailer::::::::

Date Public

2026-09-30 00:00

Credits

manus-pi manus-use

Show details on NVD website

JSON

To clipboard

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                  },
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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.

Vulnerability timeline

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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.
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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.

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