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Response snapshot Nov 4, 2026, 19:56 UTC

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VulnerabilityCVE-2026-121424

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322...

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis.

At a glance

Exploited
Not known
Severity
8.3 High (CVSS 4.0)
Chance of exploitation
0.3% in the next 30 days
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-121424 (opens a new tab)

What happened

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis. Attackers can submit addresses whose nested comment hides an attacker address, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.

Scores and how they were measured

CVSS base severity

8.3

Version 4.0As of

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.3%

Scored Percentile 27.3%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-121424 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  5. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  6. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  7. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  8. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  9. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  10. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-121424, scored 2026-11-04. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 3). Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322... (CVE-2026-121424). https://kevwire.com/record/CVE-2026-121424

MLA

"Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322... (CVE-2026-121424)." KEVWire, 3 Nov. 2026, kevwire.com/record/CVE-2026-121424.

Chicago

KEVWire. "Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322... (CVE-2026-121424)." Last modified November 3, 2026. https://kevwire.com/record/CVE-2026-121424.

Evidence summary (plain text)

Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322... (Nov 3, 2026).
Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows remote attackers to redirect recipients by ending nested RFC 5322 comments at the first closing parenthesis. Attackers can submit addresses whose nested comment hides an attacker address, bypassing conformant validators and recipient allow lists to receive mail or spoof senders in mailparser.
CVSS 8.3 (version 4.0; evidence as of Nov 3, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-121424).
EPSS 0.3% for the following 30 days, scored Nov 4, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-121424&date=2026-11-04).
Sources:
NVD CVE-2026-121424: https://nvd.nist.gov/vuln/detail/CVE-2026-121424
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T19:16:00.613Z&lastModEndDate=2026-11-03T20:55:57.138Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T18:41:03.980Z&lastModEndDate=2026-11-03T20:15:56.779Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T18:06:04.789Z&lastModEndDate=2026-11-03T19:40:57.574Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T16:21:00.766Z&lastModEndDate=2026-11-03T18:00:56.786Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T15:50:58.865Z&lastModEndDate=2026-11-03T17:20:56.846Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T15:16:09.232Z&lastModEndDate=2026-11-03T16:50:56.834Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T14:41:18.092Z&lastModEndDate=2026-11-03T16:15:56.461Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T14:06:01.225Z&lastModEndDate=2026-11-03T15:40:58.406Z&resultsPerPage=500&startIndex=0
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-121424&date=2026-11-04
Record ID: CVE-2026-121424.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 4, 2026, 18:20 UTC. Ingestion is not an independent editorial investigation.

NVD status: Awaiting Analysis. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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