StackPrism

npm package

nodemailer 9.1.0 vulnerabilities, and the version that fixes all of them

nodemailer 9.1.0 has 6 known vulnerabilities (2 rated high or critical); 10.0.9 fixes all of them.

npm (opens in a new tab) describes it as “Easy as cake e-mail sending from your Node.js applications”

Known vulnerabilities
6
2 rated high or critical
Released
Aug 31, 2026
Latest is 10.1.2
Downloads last week
72.1K
Under 1% of nodemailer downloads
Licence
MIT-0
OpenSSF Scorecard
5.7/10
nodemailer/nodemailer (opens in a new tab)
Dependencies
None
Resolved by deps.dev

What to upgrade to

10.0.9 is the closest release with no known vulnerabilities.

  • 9.1.1

    Newest 9.x release. Released Sep 1, 2026.

    5 known vulnerabilities, worst rated warning

  • 10.0.9Upgrade to this

    Fixes all 6 known vulnerabilities. Released Sep 12, 2026.

    No known vulnerabilities

  • 10.1.2

    Latest release. Released Oct 16, 2026.

    No known vulnerabilities

10.0.9 came out on Sep 12, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for nodemailer 9.1.0

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. CriticalCVE-2026-90776 on OSV.dev (opens in a new tab)GHSA-prgh-xp8r-p3m5EPSS: top 49%

    Nodemailer addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser)

    Fixed in 10.0.5. Published Sep 30, 2026.

  2. WarningCVE-2026-92595 on OSV.dev (opens in a new tab)GHSA-8m3c-c648-2xjjEPSS: top 80%

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

    Fixed in 9.1.1. Published Sep 8, 2026.

  3. CriticalCVE-2026-100700 on OSV.dev (opens in a new tab)GHSA-v53p-9fqp-m79jEPSS: top 81%

    Nodemailer: Quadratic backtracking in the addressparser free-text fallback allows remote denial of service

    Fixed in 10.0.6. Published Sep 29, 2026.

  4. WarningCVE-2026-100702 on OSV.dev (opens in a new tab)GHSA-8vvx-rff5-p5rqEPSS: top 85%

    Nodemailer: Nested structured recipient arrays bypass the parser depth limit and cause stack exhaustion DoS

    Fixed in 10.0.2. Published Sep 29, 2026.

  5. WarningCVE-2026-100699 on OSV.dev (opens in a new tab)GHSA-g57g-f23g-4646EPSS: top 92%

    Nodemailer: Quoted local-part can produce malformed envelope recipient through RFC 5322 comment parsing

    Fixed in 10.0.9. Published Sep 29, 2026.

  6. WarningCVE-2026-100701 on OSV.dev (opens in a new tab)GHSA-6vj9-mwq6-2f5vEPSS: top 99%

    Nodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure

    Fixed in 10.0.2. Published Sep 28, 2026.

Who is still on a vulnerable nodemailer

61% of last week’s 25.7M nodemailer downloads went to versions with known vulnerabilities.

From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.

Is nodemailer the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly nodemailer 9.1.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against npm, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.