7.1

CVE-2026-110871: nodemailer Uncontrolled Resource Consumption

CVSS: 7.1v4.0HighAwaiting analysis
AliasesDEBIAN-CVE-2026-110871UBUNTU-CVE-2026-110871
Published 14-10-2026Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2026-110871 is a high (CVSS 7.1) Uncontrolled Resource Consumption vulnerability in nodemailer. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.9% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-10-2026
    PublishedVulnerability first disclosed.

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

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

15-10-202619-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • node-nodemailerAll versions (No fix recorded) | < 10.0.10+~8.0.1-1
Nodemailer1 product
Ubuntu1 product
  • node-nodemailerAll versions (No fix recorded)

3 vendors · 3 products

References

5 links