CVE-2026-125755 json
Nodemailer 3.0.0 before 10.4.1 Recipient Allow-List Bypass via addressparser
published 2d ago modified yesterday also EUVD-2026-121238 , GHSA-3q53-mvfw-q9v8
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository nodemailer/nodemailer. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
Nodemailer 3.0.0 before 10.4.1 contains an address parsing flaw in addressparser that truncates domains at folding whitespace or comments before a dot, allowing attackers to bypass recipient domain restrictions. Attackers can submit crafted to, cc, bcc or replyTo addresses that pass RFC 5322 domain checks but deliver mail to an attacker-chosen address under the application's sender identity.
Patch / fix
- npm nodemailer 10.4.1
- nodemailer nodemailer 10.4.1
Is CVE-2026-125755 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.3 | 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 |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N |
| CNA | 4.0 | 8.3 | 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 |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | nodemailer | >=3.0.0, <=10.4.0 |
10.4.1 |
Affected products
- nodemailer nodemailer
Classification
- Weakness
-
- CWE-436 Interpretation Conflict
References
-
github.com
/nodemailer/nodemailer/commit/c2b9c41bb81b2294ebadd294ad15ff035a17d0a5
patch
-
github.com
/nodemailer/nodemailer/security/advisories/GHSA-3q53-mvfw-q9v8
vendor-advisory, advisory
-
github.com
/nodemailer/nodemailer/releases/tag/v10.4.1
release-notes
-
github.com
/nodemailer/nodemailer/blob/3b5cf1eec32c81f287870c8a1c9c09640062cfd5/src/addressparser/index.ts#L330-L345
technical-description
-
vulncheck.com
/advisories/nodemailer-3.0.0-before-10.4.1-recipient-allow-list-bypass-via-addressparser
third-party-advisory
Sources
- CVE List CVE-2026-125755
- NVD CVE-2026-125755
- Maintainer advisory GHSA-3q53-mvfw-q9v8
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of nodemailer/nodemailer published their own advisory on GitHub. Reviewed sources take precedence over it.