CVE-2026-44088
High
Description
SzafirHost verifies the signature of the downloaded JAR file using class JarInputStream (reading from the beginning of the file), but loads classes using class JarFile/URLClassLoader (reading the Central Directory from the end). It can lead to remote code execution by allowing an attacker to combine a genuine, signed JAR file with a malicious ZIP file, causing the verification to pass but the malicious class to be loaded. This issue was fixed in version 1.2.1.
SeverityHigh
CVSS8.6
Exploit probability—
ProductSzafirHost
PublishedMay 15, 2026
First seenMay 15, 2026
Weakness typeCWE-434Unrestricted upload of dangerous file type
How to fix
Update
- Krajowa Izba Rozliczeniowa SzafirHost1.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Krajowa Izba Rozliczeniowa SzafirHost | v < 1.2.1 | 1.2.1 |
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