CVE-2026-82854

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-31. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. When an application passes a custom envelope object with a size property containing CRLF characters to sendMail(), the value is concatenated into the SMTP MAIL FROM command (as SIZE=...) without sanitization, allowing injection of arbitrary SMTP commands such as RCPT TO to silently add attacker-controlled recipients. Exploitation requires the application to expose the envelope size to attacker-controlled input, as Nodemailer does not include size in the default auto-constructed envelope.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
65%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Nodemailer before 8.0.3 SMTP Command Injection via envelope.size | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodemailer-before-8.0.3-smtp-command-injection-via-envelope-size
github Patch Available🟡 PoC Available

SMTP command injection in Nodemailer via unsanitized `envelope.size` parameter · Advisory · nodemailer/nodemailer · GitHub

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-c7w3-x93f-qmm8

Vendor Advisories for CVE-2026-82854(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 ... 8.0.3+~7.0.11-1 (9 versions)8.0.4+~7.0.11-1—
npm(1)
PackageVulnerable rangeFixed inDependents
nodemailer—8.0.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 144× 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.

Showing the most recent 100 of 144 total refreshes for this CVE.

  1. 2026-09-19 07:08 UTCGHSA enrichment
  2. 2026-09-19 02:50 UTCGHSA enrichment
  3. 2026-09-18 22:34 UTCEG score recompute
  4. 2026-09-18 22:34 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:18 UTCGHSA enrichment
  7. 2026-09-18 13:57 UTCGHSA enrichment
  8. 2026-09-18 09:36 UTCGHSA enrichment
  9. 2026-09-18 05:20 UTCGHSA enrichment
  10. 2026-09-18 01:04 UTCGHSA enrichment
  11. 2026-09-17 20:48 UTCEG score recompute
  12. 2026-09-17 20:48 UTCGHSA enrichment
  13. 2026-09-17 16:06 UTCGHSA enrichment
  14. 2026-09-17 11:50 UTCGHSA enrichment
  15. 2026-09-17 07:33 UTCGHSA enrichment
  16. 2026-09-17 03:17 UTCGHSA enrichment
  17. 2026-09-16 23:01 UTCGHSA enrichment
  18. 2026-09-16 18:45 UTCEG score recompute
  19. 2026-09-16 18:45 UTCGHSA enrichment
  20. 2026-09-16 14:08 UTCEPSS rescore
  21. 2026-09-16 14:04 UTCGHSA enrichment
  22. 2026-09-16 09:44 UTCGHSA enrichment
  23. 2026-09-16 05:27 UTCEG score recompute
  24. 2026-09-16 05:27 UTCGHSA enrichment
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-16 01:12 UTCGHSA enrichment
  2. 2026-09-15 20:56 UTCGHSA enrichment
  3. 2026-09-15 16:40 UTCGHSA enrichment
  4. 2026-09-15 12:24 UTCGHSA enrichment
  5. 2026-09-15 08:07 UTCGHSA enrichment
  6. 2026-09-15 03:51 UTCEG score recompute
  7. 2026-09-15 03:51 UTCGHSA enrichment
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-14 23:35 UTCGHSA enrichment
  11. 2026-09-14 18:41 UTCGHSA enrichment
  12. 2026-09-14 14:22 UTCGHSA enrichment
  13. 2026-09-14 10:06 UTCGHSA enrichment
  14. 2026-09-14 05:51 UTCGHSA enrichment
  15. 2026-09-14 01:35 UTCGHSA enrichment
  16. 2026-09-13 21:19 UTCGHSA enrichment
  17. 2026-09-13 17:03 UTCEG score recompute
  18. 2026-09-13 17:03 UTCGHSA enrichment
  19. 2026-09-13 12:47 UTCGHSA enrichment
  20. 2026-09-13 08:31 UTCGHSA enrichment
  21. 2026-09-13 04:15 UTCGHSA enrichment
  22. 2026-09-12 23:59 UTCGHSA enrichment
  23. 2026-09-12 19:43 UTCGHSA enrichment
  24. 2026-09-12 15:27 UTCEG score recompute
  25. 2026-09-12 15:27 UTCGHSA enrichment
  26. 2026-09-12 11:09 UTCGHSA enrichment
  27. 2026-09-12 06:30 UTCGHSA enrichment
  28. 2026-09-12 02:14 UTCGHSA enrichment
  29. 2026-09-11 21:58 UTCGHSA enrichment
  30. 2026-09-11 17:42 UTCEG score recompute
  31. 2026-09-11 17:42 UTCGHSA enrichment
  32. 2026-09-11 14:53 UTCEPSS rescore
  33. 2026-09-11 14:53 UTCEPSS rescore
  34. 2026-09-11 13:26 UTCEG score recompute
  35. 2026-09-11 13:26 UTCGHSA enrichment
  36. 2026-09-11 09:07 UTCGHSA enrichment
  37. 2026-09-11 04:51 UTCGHSA enrichment
  38. 2026-09-11 00:35 UTCGHSA enrichment
  39. 2026-09-10 20:19 UTCGHSA enrichment
  40. 2026-09-10 16:02 UTCGHSA enrichment
  41. 2026-09-10 12:43 UTCEG score recompute
  42. 2026-09-10 12:43 UTCGHSA enrichment
  43. 2026-09-10 08:26 UTCGHSA enrichment
  44. 2026-09-10 04:09 UTCGHSA enrichment
  45. 2026-09-09 23:45 UTCGHSA enrichment
  46. 2026-09-09 16:56 UTCGHSA enrichment
  47. 2026-09-09 12:19 UTCGHSA enrichment
  48. 2026-09-09 08:03 UTCGHSA enrichment
  49. 2026-09-09 03:47 UTCGHSA enrichment
  50. 2026-09-08 23:31 UTCEG score recompute
  51. 2026-09-08 23:31 UTCGHSA enrichment
  52. 2026-09-08 22:01 UTCEPSS rescore
  53. 2026-09-08 10:05 UTCGHSA enrichment
  54. 2026-09-08 05:09 UTCGHSA enrichment
  55. 2026-09-08 00:49 UTCGHSA enrichment
  56. 2026-09-07 20:32 UTCGHSA enrichment
  57. 2026-09-07 16:17 UTCEG score recompute
  58. 2026-09-07 16:16 UTCGHSA enrichment
  59. 2026-09-07 12:00 UTCGHSA enrichment
  60. 2026-09-07 07:40 UTCGHSA enrichment
  61. 2026-09-07 03:23 UTCGHSA enrichment
  62. 2026-09-06 23:06 UTCGHSA enrichment
  63. 2026-09-06 18:47 UTCGHSA enrichment
  64. 2026-09-06 14:31 UTCEG score recompute
  65. 2026-09-06 14:31 UTCGHSA enrichment
  66. 2026-09-06 13:48 UTCEPSS rescore
  67. 2026-09-06 10:15 UTCGHSA enrichment
  68. 2026-09-06 05:59 UTCGHSA enrichment
  69. 2026-09-06 01:44 UTCGHSA enrichment
  70. 2026-09-05 21:26 UTCGHSA enrichment
  71. 2026-09-05 17:10 UTCEG score recompute
  72. 2026-09-05 17:10 UTCGHSA enrichment
  73. 2026-09-05 15:31 UTCEPSS rescore
  74. 2026-09-05 12:54 UTCGHSA enrichment
  75. 2026-09-05 08:38 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-82854?
CVE-2026-82854 is a critical vulnerability published on August 31, 2026. Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size parameter. When an application passes a custom envelope object with a size property containing CRLF characters to sendMail(), the value is concatenated into the SMTP MAIL FROM command (as SIZE=...)…
When was CVE-2026-82854 disclosed?
CVE-2026-82854 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-2026-82854 actively exploited?
CVE-2026-82854 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 35.0% of all scored CVEs.
What is the CVSS score of CVE-2026-82854?
CVE-2026-82854 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-82854?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82854, 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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