What’s Vulnerable › Vulnerabilities

CVE-2026-44088: Remote Code Execution in SzafirHost

• Severity: high (CVSS 8.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-15 · updated 2026-10-26
• Weakness: CWE-434

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.

Affected products

• Krajowa Izba Rozliczeniowa SzafirHost: before 1.2.1 — fixed in 1.2.1

How to fix

Upgrade to a fixed version: Krajowa Izba Rozliczeniowa SzafirHost 1.2.1. Check the vendor advisory for mitigations.

References

• https://cert.pl/posts/2026/05/CVE-2026-44088
• https://www.elektronicznypodpis.pl/

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