EUVD-2026-68442
GHSA-2x76-7hhq-pgvw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Reachable only when the app exposes envelope.size (non-default target condition) so AC:H; no auth at Nodemailer level (PR:N); injection manipulates the downstream SMTP dialogue (S:C) redirecting mail (I:H) and enabling content exfiltration (C:L).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4Blast Radius
ecosystem impact- 44 npm packages depend on nodemailer (32 direct, 13 indirect)
Ecosystem-wide dependent count for version 8.0.4.
DescriptionCVE.org
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.
AnalysisAI
SMTP command injection in Nodemailer before 8.0.4 lets attackers smuggle arbitrary SMTP verbs (notably RCPT TO) into outgoing mail by planting CRLF characters in the envelope.size value, silently adding attacker-controlled recipients or otherwise manipulating the MAIL FROM dialogue. Only applications that pass a custom envelope object and expose its size property to untrusted input are affected, since Nodemailer's default auto-constructed envelope never sets size. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target application to (1) pass a custom envelope object to sendMail() rather than relying on the default auto-constructed envelope, AND (2) populate that envelope's size property from attacker-controllable input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) yields a 9.3 critical score, but that figure assumes the vulnerable code path is reachable, which it is not by default: the description and advisory both state the application must explicitly pass a custom envelope with a size property sourced from attacker-controlled input. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 8.0.4 - upgrade the nodemailer dependency to 8.0.4 or later (fix commit https://github.com/nodemailer/nodemailer/commit/2d7b9710e63555a1eb13d721296c51186d4b5651, advisory https://github.com/nodemailer/nodemailer/security/advisories/GHSA-c7w3-x93f-qmm8). … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Nodemailer
View allThis affects the package nodemailer before 6.4.16. Rated critical severity (CVSS 9.8), this vulnerability is remotely ex
The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain n
TLS certificate verification is disabled by hardcoded `rejectUnauthorized: false` in Nodemailer's internal HTTPS fetch c
Sandbox bypass in nodemailer <= 9.0.0 exposes arbitrary file read and full-response SSRF to any authenticated applicatio
SMTP command injection in Nodemailer (npm) versions up to and including 8.0.4 allows an attacker who can influence the t
CRLF injection in Nodemailer's List-* header construction allows any application-level user with control over list comme
Nodemailer's jsonTransport transport fails to enforce disableFileAccess and disableUrlAccess controls during message nor
Same technique Command Injection
View allShare
External POC / Exploit Code
Leaving vuln.today