CVE-2026-82853

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-08-31. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.9Exploit: Elevated riskExposed: 0

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

Nodemailer versions before 8.0.5 contain an SMTP command injection vulnerability in the transport name option used in EHLO/HELO commands. The name parameter is concatenated directly into SMTP commands without sanitizing carriage return and line feed characters, allowing attackers to inject arbitrary SMTP commands for email spoofing and phishing attacks.

CVSS v3
4.9
EG Score
4.9(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity49% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
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 8.0.5 SMTP Command Injection via CRLF | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodemailer-before-8.0.5-smtp-command-injection-via-crlf
github Patch Available🟡 PoC Available

SMTP Command Injection via CRLF in Transport name Option (EHLO/HELO) · Advisory · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-vvjj-xcjg-gr5g

Vendor Advisories for CVE-2026-82853(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—8.0.5—

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. 2026-09-19 06:34 UTCEG score recompute
  2. 2026-09-19 06:34 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 04:50 UTCEG score recompute
  5. 2026-09-18 04:50 UTCGHSA enrichment
  6. 2026-09-17 03:06 UTCEG score recompute
  7. 2026-09-17 03:06 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-16 01:21 UTCEG score recompute
  11. 2026-09-16 01:20 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 23:35 UTCGHSA enrichment
  15. 2026-09-13 21:13 UTCEG score recompute
  16. 2026-09-13 21:13 UTCGHSA enrichment
  17. 2026-09-12 19:30 UTCEG score recompute
  18. 2026-09-12 19:30 UTCGHSA enrichment
  19. 2026-09-11 17:46 UTCEG score recompute
  20. 2026-09-11 17:46 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. 2026-09-10 03:22 UTCGHSA enrichment
Show 31 more
  1. 2026-09-09 01:39 UTCEG score recompute
  2. 2026-09-09 01:39 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 23:55 UTCEG score recompute
  5. 2026-09-07 23:55 UTCGHSA enrichment
  6. 2026-09-06 22:10 UTCEG score recompute
  7. 2026-09-06 22:10 UTCGHSA enrichment
  8. 2026-09-06 13:48 UTCEPSS rescore
  9. 2026-09-05 20:26 UTCEG score recompute
  10. 2026-09-05 20:26 UTCGHSA enrichment
  11. 2026-09-05 15:31 UTCEPSS rescore
  12. 2026-09-04 18:43 UTCEG score recompute
  13. 2026-09-04 18:43 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-03 16:46 UTCGHSA enrichment
  16. 2026-09-02 15:01 UTCEG score recompute
  17. 2026-09-02 15:01 UTCGHSA enrichment
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-09-01 13:11 UTCEG score recompute
  21. 2026-09-01 13:11 UTCGHSA enrichment
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-31 11:26 UTCEG score recompute
  25. 2026-08-31 11:26 UTCGHSA enrichment
  26. 2026-08-31 11:06 UTCEG score recompute
  27. 2026-08-31 11:06 UTCGHSA enrichment
  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

Frequently asked(5)

What is CVE-2026-82853?
CVE-2026-82853 is a medium vulnerability published on August 31, 2026. Nodemailer versions before 8.0.5 contain an SMTP command injection vulnerability in the transport name option used in EHLO/HELO commands. The name parameter is concatenated directly into SMTP commands without sanitizing carriage return and line feed characters, allowing attackers to inject…
When was CVE-2026-82853 disclosed?
CVE-2026-82853 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-2026-82853 actively exploited?
CVE-2026-82853 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82853?
CVE-2026-82853 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-82853?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82853, 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-2026-82853

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