CVE Feed

    Dashboard / CVE / CVE-2026-100700

    CVE-2026-100700

    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.

    Published:Sep 26, 2026
    Last Modified:Sep 28, 2026
    EPS:Sep 26, 2026
    EPSS Score:0.00279
    CVSS Score:7.5

    Affected Products

    Vendor
    Nodemailer
    Product
    Nodemailer

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-121426 (CVSS 8.3) — Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that ends an an…
    CVE-2026-121425 (CVSS 8.3) — Nodemailer from 3.0.0 before 10.1.4 contains a parsing flaw in addressparser that ends an RFC 5322 group at a …
    CVE-2026-121424 (CVSS 8.3) — Nodemailer from 3.0.0 before 10.1.4 contains an address parsing vulnerability in addressparser that allows rem…
    CVE-2026-110872 (CVSS 8.2) — Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SM…
    CVE-2026-110871 (CVSS 7.1) — Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders …
    CVE-2026-110870 (CVSS 6.9) — Nodemailer from 3.0.0 before 10.0.13 contains an improper input validation vulnerability in its address parser…
    CVE-2026-110869 (CVSS 8.7) — Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whos…
    CVE-2026-100702 (CVSS 8.2) — Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, an…
    CVE-2026-100701 (CVSS 6) — Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, wh…
    CVE-2026-100699 (CVSS 6.9) — Nodemailer is a Node.js email-sending library. In versions >= 9.1.0 and < 10.0.9, the address parser (src/addr…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High