CVE-2026-100700

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-26. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
65
EG Risk 65/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 26, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

nodemailer before 10.0.6 Denial of Service via addressparser | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser
github Patch Available🟡 PoC Available

Quadratic backtracking in the addressparser free-text fallback allows remote denial of service · Advisory · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j

Vendor Advisories for CVE-2026-100700(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
nodemailer—10.0.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 31× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 01:43 UTCEG score recompute
  2. 2026-10-04 01:43 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-03 14:09 UTCGHSA enrichment
  5. 2026-10-03 02:35 UTCEG score recompute
  6. 2026-10-03 02:35 UTCGHSA enrichment
  7. 2026-10-02 15:00 UTCGHSA enrichment
  8. 2026-10-02 03:26 UTCEG score recompute
  9. 2026-10-02 03:26 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 15:52 UTCGHSA enrichment
  12. 2026-10-01 04:18 UTCGHSA enrichment
  13. 2026-09-30 16:44 UTCEG score recompute
  14. 2026-09-30 16:44 UTCGHSA enrichment
  15. 2026-09-30 15:02 UTCEPSS rescore
  16. 2026-09-30 14:50 UTCGHSA enrichment
  17. 2026-09-30 03:17 UTCGHSA enrichment
  18. 2026-09-29 15:42 UTCEG score recompute
  19. 2026-09-29 15:42 UTCGHSA enrichment
  20. 2026-09-29 15:20 UTCEPSS rescore
  21. 2026-09-29 04:07 UTCEG score recompute
  22. 2026-09-29 04:07 UTCGHSA enrichment
  23. 2026-09-28 16:32 UTCEG score recompute
  24. 2026-09-28 16:32 UTCGHSA enrichment
  25. 2026-09-28 15:23 UTCEG score recompute
Show 11 more
  1. 2026-09-28 15:22 UTCGHSA enrichment
  2. 2026-09-28 13:50 UTCEPSS rescore
  3. 2026-09-28 12:48 UTCGHSA enrichment
  4. 2026-09-28 01:14 UTCEG score recompute
  5. 2026-09-28 01:14 UTCGHSA enrichment
  6. 2026-09-27 13:40 UTCGHSA enrichment
  7. 2026-09-27 02:03 UTCEG score recompute
  8. 2026-09-27 02:03 UTCGHSA enrichment
  9. 2026-09-26 14:29 UTCEG score recompute
  10. 2026-09-26 13:35 UTCEG score recompute
  11. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-100700?
CVE-2026-100700 is a high vulnerability published on September 26, 2026. 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…
When was CVE-2026-100700 disclosed?
CVE-2026-100700 was first published on September 26, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100700 actively exploited?
CVE-2026-100700 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100700?
CVE-2026-100700 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100700?
A fix for CVE-2026-100700 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100700 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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