# CVE-2026-100700: node-nodemailer: nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pat...

CVE-2026-100700 is fixed in node-nodemailer on 1 platform by DEBIAN-CVE-2026-100700 (version 10.0.10+~8.0.1-1), released September 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-100700
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 26, 2026

## Description

nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-nodemailer Debian 14 | 10.0.10+~8.0.1-1 | [DEBIAN-CVE-2026-100700](https://patchblox.com/security/data/fix/linux/debian-cve-2026-100700.md) | Sep 27, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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