Vulnerability · Published Jun 29, 2026 · Assigned by CERT-PL
CVE-2026-13165Remote Code Execution in SzafirHost
High 8.6
In plain English
A high-severity unrestricted file upload in SzafirHost from Krajowa Izba Rozliczeniowa. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official description
SzafirHost verifies the downloaded native library archive with one JarFile parser (reading the Central Directory) but extracts native libraries with JarInputStream parser (reading sequentially from local file headers). An attacker who controls the served archive can insert a malicious DLL/SO/DYLIB as a local-file-header entry between the last legitimate entry and the Central Directory, without adding it to the Central Directory. The signature verifier never sees the injected entry and accepts the archive as validly signed; the extractor reads it sequentially and writes the attacker library to the native temp directory with no hash check), while the archive-size check still passes. This can lead to remote code execution. This issue was fixed in version 1.2.2.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Krajowa Izba Rozliczeniowa | SzafirHost | 0 – before 1.2.2 |
Weakness: CWE-434 · 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
References
- https://cert.pl/posts/2026/06/CVE-2026-13165 third-party-advisory
- https://www.elektronicznypodpis.pl/ product