CVE-2026-90776

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-13. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

September 13, 2026

Last Modified

September 16, 2026

Advisory Details (6)

Auto-updated Sep 13, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
generic

Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodemailer-9.1.0-through-10.0.4-denial-of-service-via-quadratic-address-parsing
generic

GitHub - nodemailer/nodemailer: ✉️ Send e-mails with Node.JS – easy as cake! · GitHub

https://github.com/nodemailer/nodemailer
github_release Patch Available

v10.0.5

Patch available: nodemailer/nodemailer v10.0.5

https://github.com/nodemailer/nodemailer/releases/tag/v10.0.5
generic

nodemailer/src/addressparser/index.ts at v10.0.4 · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/blob/v10.0.4/src/addressparser/index.ts#L251
github_commit Patch Available

commit c07f17518d25 (nodemailer/nodemailer)

Patch available: nodemailer/nodemailer v10.0.5 (contains commit c07f17518d25)

https://github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca538c24b89
github Patch Available🟡 PoC Available

addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser) · Advisory · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5

Vendor Advisories for CVE-2026-90776(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 25× 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. 2026-09-18 21:16 UTCEG score recompute
  2. 2026-09-18 21:16 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 08:15 UTCGHSA enrichment
  5. 2026-09-17 19:35 UTCEG score recompute
  6. 2026-09-17 19:35 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-17 04:10 UTCGHSA enrichment
  9. 2026-09-16 15:30 UTCEG score recompute
  10. 2026-09-16 15:30 UTCGHSA enrichment
  11. 2026-09-16 14:26 UTCEG score recompute
  12. 2026-09-16 14:26 UTCGHSA enrichment
  13. 2026-09-16 14:09 UTCEPSS rescore
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-16 03:44 UTCGHSA enrichment
  16. 2026-09-15 15:03 UTCEG score recompute
  17. 2026-09-15 15:03 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 02:19 UTCGHSA enrichment
  20. 2026-09-14 13:39 UTCGHSA enrichment
  21. 2026-09-14 00:58 UTCEG score recompute
  22. 2026-09-14 00:58 UTCGHSA enrichment
  23. 2026-09-13 12:18 UTCEG score recompute
  24. 2026-09-13 11:49 UTCEG score recompute
  25. 2026-09-13 11:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-90776?
CVE-2026-90776 is a high vulnerability published on September 13, 2026. Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js…
When was CVE-2026-90776 disclosed?
CVE-2026-90776 was first published in the National Vulnerability Database on September 13, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90776 actively exploited?
CVE-2026-90776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.6% of all scored CVEs.
What is the CVSS score of CVE-2026-90776?
CVE-2026-90776 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-90776?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90776, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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