CVE-2026-44088

Remote Code Execution in SzafirHost

Published May 15, 2026 CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Krajowa Izba Rozliczeniowa
Krajowa Izba Rozliczeniowa szafirhost
Vendors & Products Krajowa Izba Rozliczeniowa
Krajowa Izba Rozliczeniowa szafirhost
Type Values Removed Values Added
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.
Title Remote Code Execution in SzafirHost
Weaknesses CWE-434
References
Metrics cvssV4_0

{'score': 8.6, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-PL
Published
Updated
May 15, 2026, 11:07 AM
Reserved
May 5, 2026, 9:40 AM
Status
Deferred
Published
May 15, 2026, 9:16 AM
Modified
Oct 26, 2026, 2:10 PM