CVE-2026-82660: Nodemailer jsonTransport bypasses disableFileAccess and disableUrlAccess

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-31 · updated 2026-09-10
Weakness: CWE-862

Description

Nodemailer before 8.0.9 fails to enforce disableFileAccess and disableUrlAccess options during message normalization in jsonTransport. Attackers can read local files or fetch URLs by supplying path or href values in message content fields, bypassing intended access controls.

Affected products

nodemailer: before 8.0.9 — fixed in 8.0.9

How to fix

Upgrade to a fixed version: nodemailer 8.0.9. Check the vendor advisory for mitigations.

References

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wqvq-jvpq-h66f
https://www.vulncheck.com/advisories/nodemailer-jsontransport-bypasses-disablefileaccess-and-disableurlaccess
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wqvq-jvpq-h66f

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