Remote Code Execution in SzafirHost Native Library Archive Verification
CVE-2026-13165 is a remote code execution vulnerability in SzafirHost affecting versions prior to 1.2.2. The flaw is caused by inconsistent parsing of downloaded native library archives during verification and extraction. SzafirHost verifies the archive signature using a JarFile parser that reads the ZIP/JAR Central Directory, but extracts native libraries using JarInputStream, which processes entries sequentially from local file headers. An attacker who controls the served archive can append or insert a malicious native library entry (DLL, SO, or DYLIB) as a local-file-header entry between the last legitimate file and the Central Directory without listing that entry in the Central Directory. Because the verifier only evaluates Central Directory entries, it does not see the injected file and accepts the archive as validly signed. The extractor, however, reads the injected entry sequentially and writes the attacker-controlled library into the native temporary directory without an additional hash check. The archive-size check still passes, enabling signature-bypass-driven loading of attacker-supplied native code.
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Recent activity
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A remote code execution vulnerability in SzafirHost caused by inconsistent archive verification and extraction logic, allowing a malicious native library to be injected into a signed archive without being seen by the signature verifier.
A remote code execution vulnerability in Krajowa Izba Rozliczeniowa SzafirHost caused by inconsistent parsing and verification of signed native library archives, allowing a malicious library to be injected into the archive without being seen by the signature verifier.
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