CVE-2026-29144 Unicode Subject Tags

What is CVE-2026-29144?

CVE-2026-29144 is a high-severity vulnerability in SEPPmail Secure Email Gateway, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge security tags using Unicode lookalike characters.

Weakness: CWE-20

Which versions are affected by CVE-2026-29144?

It affects 1 product.

Products include Seppmail Secure Email Gateway.

How do I fix CVE-2026-29144?

No fix has been published for CVE-2026-29144 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-29144 being exploited?

There is no known exploitation of CVE-2026-29144 in the wild and no public exploit code.

Other vulnerabilities in SEPPmail Secure Email Gateway

• CVE-2026-29139 GINA State Confusion Account Takeover High 7.8
• CVE-2026-29143 S/MIME Decryption Impersonation High 7.8
• CVE-2026-29140 S/MIME Signature Additional Certificate High 7.7
• CVE-2026-29141 Bounded Subject Tag Sanitization High 7.7
• CVE-2026-29132 ESWmail-Verify Bypass Medium 6.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vc5m-vgvg-698r.