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Advisory record · GHSA-v53p-9fqp-m79j

Nodemailer: Quadratic backtracking in the addressparser free-text fallback allows remote denial of service

CVSS 8.7 HighEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 23:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nodemailernpm<10.0.610.0.6
Identifiers
GHSA-v53p-9fqp-m79j · CVE-2026-100700
Weakness (CWE)
CWE-407 · CWE-1333
Tags
Published
29 Sept 2026
Updated
30 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Nodemailer versions before 10.0.6 have a quadratic backtracking flaw in the addressparser free-text fallback, where a long whitespace-free header value can stall parsing for tens of seconds. An attacker who can deliver a crafted header value, for example to an inbound mail parser such as mailparser, needs no account and can block the Node.js event loop, denying service to the process. Upgrade to Nodemailer 10.0.6.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:34 UTC First seen by agentprime
  2. 31 Oct 2026, 13:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.