CVE-2026-82662

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-31. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

Nodemailer before 8.0.8 disables TLS certificate verification in lib/fetch/index.js through rejectUnauthorized: false, allowing attackers to intercept OAuth2 token requests. Attackers in a machine-in-the-middle position can capture OAuth client secrets, refresh tokens, and access tokens transmitted over compromised HTTPS connections.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Aug 31, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Nodemailer before 8.0.8 TLS Certificate Validation Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodemailer-before-8.0.8-tls-certificate-validation-bypass
github Patch Available🟡 PoC Available

Improper TLS Certificate Validation in OAuth2 Token Fetch Enables Credential Interception · Advisory · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-r7g4-qg5f-qqm2

Vendor Advisories for CVE-2026-82662(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-nodemailer6.10.0+~6.4.17-1 ... 9.0.6+~8.0.1-1 (24 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-nodemailer6.10.0+~6.4.17-1 ... 9.0.6+~8.0.1-1 (17 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-nodemailer6.10.0+~6.4.17-1 ... 8.0.4+~7.0.11-2 (11 versions)8.0.11+~8.0.1-1—
npm(1)
PackageVulnerable rangeFixed inDependents
nodemailer—8.0.8—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 56× 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 21:26 UTCEG score recompute
  2. 2026-09-18 21:26 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 20:48 UTCEG score recompute
  5. 2026-09-17 20:48 UTCGHSA enrichment
  6. 2026-09-16 18:45 UTCEG score recompute
  7. 2026-09-16 18:45 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 17:25 UTCEG score recompute
  11. 2026-09-15 17:25 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 17:08 UTCGHSA enrichment
  15. 2026-09-13 16:52 UTCEG score recompute
  16. 2026-09-13 16:52 UTCGHSA enrichment
  17. 2026-09-12 16:35 UTCEG score recompute
  18. 2026-09-12 16:35 UTCGHSA enrichment
  19. 2026-09-11 16:19 UTCEG score recompute
  20. 2026-09-11 16:19 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-10 16:02 UTCEG score recompute
  24. 2026-09-10 16:02 UTCGHSA enrichment
  25. 2026-09-09 23:48 UTCGHSA enrichment
Show 31 more
  1. 2026-09-08 23:31 UTCEG score recompute
  2. 2026-09-08 23:31 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 17:30 UTCEG score recompute
  5. 2026-09-07 17:30 UTCGHSA enrichment
  6. 2026-09-06 17:14 UTCEG score recompute
  7. 2026-09-06 17:14 UTCGHSA enrichment
  8. 2026-09-06 13:48 UTCEPSS rescore
  9. 2026-09-05 16:57 UTCEG score recompute
  10. 2026-09-05 16:57 UTCGHSA enrichment
  11. 2026-09-05 15:31 UTCEPSS rescore
  12. 2026-09-04 16:38 UTCEG score recompute
  13. 2026-09-04 16:38 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-03 16:18 UTCGHSA enrichment
  16. 2026-09-02 16:01 UTCEG score recompute
  17. 2026-09-02 16:00 UTCGHSA enrichment
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 15:43 UTCEG score recompute
  20. 2026-09-01 15:43 UTCGHSA enrichment
  21. 2026-09-01 15:13 UTCEG score recompute
  22. 2026-09-01 15:13 UTCGHSA enrichment
  23. 2026-09-01 13:54 UTCEPSS rescore
  24. 2026-09-01 09:55 UTCEG score recompute
  25. 2026-09-01 09:55 UTCGHSA enrichment
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-31 09:37 UTCEG score recompute
  29. 2026-08-31 09:37 UTCGHSA enrichment
  30. 2026-08-31 08:55 UTCEG score recompute
  31. 2026-08-31 08:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82662?
CVE-2026-82662 is a medium vulnerability published on August 31, 2026. Nodemailer before 8.0.8 disables TLS certificate verification in lib/fetch/index.js through rejectUnauthorized: false, allowing attackers to intercept OAuth2 token requests. Attackers in a machine-in-the-middle position can capture OAuth client secrets, refresh tokens, and access tokens transmitted…
When was CVE-2026-82662 disclosed?
CVE-2026-82662 was first published in the National Vulnerability Database on August 31, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82662 actively exploited?
CVE-2026-82662 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 97.5% of all scored CVEs.
What is the CVSS score of CVE-2026-82662?
CVE-2026-82662 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-82662?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82662, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-82662

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