CVE-2026-29138 PGP Decryption Sender LDAP Injection

What is CVE-2026-29138?

CVE-2026-29138 is a medium-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 attackers with a specially crafted email address to claim another user's PGP signature as their own.

Weakness: CWE-90

Which versions are affected by CVE-2026-29138?

It affects 1 product.

Products include Seppmail Secure Email Gateway.

How do I fix CVE-2026-29138?

No fix has been published for CVE-2026-29138 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-29138 being exploited?

There is no known exploitation of CVE-2026-29138 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-whc5-mvj9-gjqw.