PT-2026-41271 · Krajowa Izba Rozliczeniowa · Szafirhost

Mariusz Maik · Published 2026-05-15 · Updated 2026-05-15 · CVE-2026-44088

NVD

CVSS v4.0

8.6

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-44088

Affected Products

Szafirhost

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-44088 · Security Note
• https://cert.pl/posts/2026/05/CVE-2026-44088 · Note
• https://elektronicznypodpis.pl · Note