Nodemailer: resolveContent() on a MailMessage bypasses disableFileAccess/disableUrlAccess when called with the legacy signature

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.9 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

EPSS

• CVE-2026-92595: 0.29% estimated exploitation activity in the next 30 days; percentile 22.29 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Nodemailer's disableFileAccess / disableUrlAccess options are a security sandbox that lets an application forbid untrusted message content (html/text/attachment path/href) from reading local files or making outbound HTTP(S) requests. The fix for GHSA-wqvq-jvpq-h66f (commit 5f69497) threaded these flags through the library's internal resolution paths (MailMessage.resolveAll() and convertDataImages()), but the public plugin API MailMessage.resolveContent(...args) (lib/mailer/mail-message.js:41-43) remains a raw passthrough to shared.resolveContent(). When called with the documented legacy signature mail.resolveContent(data, key, callback), shared.resolveContent normalizes the missing options argument to an empty object (options = options || {}, lib/shared/index.js:530). The message-level flags that the MailMessage constructor already copied into mail.data (lib/mailer/mail-message.js:34-38) are silently discarded, so resolveContentValue skips both access-control guards and…

Published by the source

8 Sep 2026, 21:16 UTC

Last modified by the source

17 Sep 2026, 11:56 UTC

Source last checked

26 Oct 2026, 13:02 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-8m3c-c648-2xjj

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-8m3c-c648-2xjj

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-8m3c-c648-2xjj

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# Patch Next advisory brief: CVE-2026-92595

Advisory: Nodemailer: resolveContent() on a MailMessage bypasses disableFileAccess/disableUrlAccess when called with the legacy signature
IDs: CVE-2026-92595, GHSA-8m3c-c648-2xjj
Record: https://patchnext.com/advisories/ghsa-8m3c-c648-2xjj (revision 3, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: nodemailer 9.1.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm nodemailer: affected <= 9.1.0; fixed in 9.1.1

## Suggested inspection (read-only)
- `npm ls nodemailer --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nodemailer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-8m3c-c648-2xjj (GitHub-reviewed advisory GHSA-8m3c-c648-2xjj lists affected ranges: npm nodemailer >=0 <=9.1.0)
- Verified: https://osv.dev/vulnerability/GHSA-8m3c-c648-2xjj (OSV record GHSA-8m3c-c648-2xjj lists affected ranges: npm nodemailer >=0 <9.1.1 (fixed))

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