EUVD-2026-30512
GHSA-j8f8-frc5-vgc6
CVSS VectorNVD
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/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
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Remote code execution in SzafirHost before 1.2.1 allows unauthenticated attackers to bypass JAR signature verification through a ZIP file smuggling technique. The vulnerability exploits a discrepancy between verification logic (JarInputStream reading from file beginning) and class loading (JarFile/URLClassLoader reading Central Directory from file end), enabling attackers to combine a legitimately signed JAR with malicious classes. …
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RemediationAI
Within 24 hours: Identify all SzafirHost instances in your environment and document current versions; disable or restrict access to SzafirHost applications until patched. Within 7 days: Upgrade all SzafirHost deployments to version 1.2.1 or later per vendor advisory. …
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External POC / Exploit Code
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