CVE-2026-29133 UID Regex Bypass

What is CVE-2026-29133?

CVE-2026-29133 is a medium-severity vulnerability in SEPPmail Secure Email Gateway, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to upload PGP keys with UIDs that do not match their email address.

Weakness: CWE-20

Which versions are affected by CVE-2026-29133?

It affects 1 product.

Products include Seppmail Secure Email Gateway.

How do I fix CVE-2026-29133?

No fix has been published for CVE-2026-29133 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-29133 being exploited?

There is no known exploitation of CVE-2026-29133 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-2026-29144 Unicode Subject Tags High 7.8
• CVE-2026-29140 S/MIME Signature Additional Certificate High 7.7
• CVE-2026-29141 Bounded Subject Tag Sanitization High 7.7

Sources

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

Also known as GHSA-g982-ffmg-jq3g.