6.9

CVE-2026-110870: nodemailer Improper Input Validation

CVSS: 6.9v4.0MediumAwaiting analysis
AliasesDEBIAN-CVE-2026-110870UBUNTU-CVE-2026-110870
Published 14-10-2026Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2026-110870 is a medium (CVSS 6.9) Improper Input Validation vulnerability in nodemailer. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.22%
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 10.0.13 contains an improper input validation vulnerability in its address parser that fails to strip RFC 5322 comments inside angle-bracket addresses. Attackers can supply recipients like a display name with a parenthesized comment in the domain, so illegal characters reach envelope.to and RCPT TO, causing rejected delivery or parser interpretation conflicts that bypass domain allow-lists.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

15-10-202619-10-2026
EPSS score
0.22%

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) | < 10.0.13+~8.0.2-1
Nodemailer1 product
Ubuntu1 product
  • node-nodemailerAll versions (No fix recorded)

3 vendors · 3 products

References

5 links