CVE-2026-23829
Mailpit has an SMTP Header Injection via Regex Bypass in github.com/axllent/mailpit
5.3
MEDIUM
CVSS 3.1
EPSS 1.4%
Description
Mailpit has an SMTP Header Injection via Regex Bypass in github.com/axllent/mailpit
How to fix CVE-2026-23829
To remediate CVE-2026-23829, upgrade the affected package to a fixed version below.
- Go/github.com/axllent/mailpit—upgrade to 1.28.3 or later
- Go/github.com/axllent/mailpit—upgrade to 1.28.3 or later
Is CVE-2026-23829 being exploited?
Low — EPSS is 1.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.28.3
- from 0, < 1.28.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |