Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Nodemailer versions before 8.0.8 disable TLS certificate verification in their internal HTTPS fetch client used for OAuth2 token requests, so those requests accept invalid or self-signed certificates. An attacker in a man-in-the-middle position between the application and the OAuth endpoint could intercept OAuth2 credentials such as the client secret, refresh token, and access tokens, and could then access mail or send mail. Upgrade to Nodemailer 8.0.8, which is the fixed version listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.3 | High | 4.0 | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0019, the 8th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:34 UTC First seen by agentprime
- 31 Oct 2026, 13:34 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-r7g4-qg5f-qqm2
- OSV: GHSA-r7g4-qg5f-qqm2
- github.com/nodemailer/nodemailer/security/advisories/GHSA-r7g4-qg5f-qqm2
- nvd.nist.gov/vuln/detail/CVE-2026-82662
- github.com/nodemailer/nodemailer
- www.vulncheck.com/advisories/nodemailer-before-8.0.8-tls-certificate-validation-bypass