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CVE-2026-44126 is an insecure deserialization vulnerability in SEPPmail Secure Email Gateway affecting versions before 15.0.4. According to the provided content, the flaw is reachable from the new GINA UI, where the application deserializes untrusted attacker-controlled data. By supplying a crafted serialized object, an unauthenticated remote attacker may trigger unsafe object deserialization and achieve remote code execution on the gateway. The issue is explicitly described as deserialization of untrusted data and classified as CWE-502.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical deserialization vulnerability that permits unauthenticated remote code execution via a crafted serialized object.
An insecure deserialization vulnerability in SEPPMail mentioned in the overview of fixed issues.
An insecure deserialization vulnerability in SEPPmail Secure Email Gateway before version 15.0.4 that may allow unauthenticated remote code execution via a crafted serialized object reachable from the new GINA UI.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.