RCE in SzafirHost native library archive verification
CVE-2026-13165 is a remote code execution vulnerability in Krajowa Izba Rozliczeniowa's SzafirHost affecting versions prior to 1.2.2. The flaw is caused by inconsistent parsing of downloaded signed native library archives: SzafirHost verifies the archive with a JarFile parser that reads the ZIP/JAR Central Directory, but extracts native libraries with 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 it in the Central Directory. Because the verifier only inspects Central Directory entries, it does not see the injected file and accepts the archive as validly signed. The extractor, however, reads the hidden entry sequentially and writes the attacker-controlled library into the native temporary directory without an additional hash check. This parser differential allows a malicious native library to bypass signature verification and be loaded, leading to code execution.
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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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