CVE-2026-44088 Remote Code Execution in SzafirHost
Attackers can achieve remote code execution by crafting a JAR file that bypasses signature verification due to inconsistent parsing logic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-44088?
CVE-2026-44088 is a high-severity code injection vulnerability in Krajowa Izba Rozliczeniowa SzafirHost, published on 15 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-44088?
How do I fix CVE-2026-44088?
No fix has been published for CVE-2026-44088 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44088 being exploited?
There is no known exploitation of CVE-2026-44088 in the wild and no public exploit code.
Sources
Also known as GHSA-j8f8-frc5-vgc6.