GHSA-WXXX-R42M-9RP8: nodemailer Npm
Vulnerability summary
GHSA-WXXX-R42M-9RP8 is a high (CVSS 7.1) vulnerability in nodemailer Npm.
Not severe (CVSS 7.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 15-10-2026PublishedVulnerability first disclosed.
- 22-10-2026Last modifiedVulnerability information updated.
Description
Duplicate Advisory: Nodemailer: Quadratic (O(n^2)) DKIM header unfolding lets a large folded header cause remote denial of service during signing ## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-39m8-27wv-hr27. This link is maintained to preserve external references. ## Original Description Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
No EPSS score has been published for this record yet.
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Npm1 product
- nodemailer≥ 3.0.0, ≤ 10.0.9
1 vendor · 1 product
