CVE-2026-44088
Remote Code Execution in SzafirHost
- State
- Published
- Severity
- 8.6 High
- Published
- May 15, 2026
- Updated
- May 15, 2026
- Reserved
- May 5, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L | CERT-PL |
Weaknesses
- CWE-434 Unrestricted Upload of File with Dangerous Type
Affected Products
| Product | Versions |
|---|---|
SzafirHostKrajowa Izba Rozliczeniowa |
|
References
- https://cert.pl/posts/2026/05/CVE-2026-44088third-party-advisory
- https://www.elektronicznypodpis.pl/product
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