SB2025061842 - Multiple vulnerabilities in ClamAV

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2025-20234)

The vulnerability allows a remote attacker to gain access to perform a denial of service attack.

The vulnerability exists due to a boundary condition when handling UDF files. A remote attacker can pass a specially crafted UDF file to the application, trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.

2) Out-of-bounds write (CVE-ID: CVE-2025-20260)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing PDF files. A remote attacker can pass a specially crafted PDF file to the application, trigger an out-of-bounds write and execute arbitrary code on the target system.

3) Use-after-free (CVE-ID: N/A)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Xz decompression module. A remote attacker can pass a specially crafted archive to the application and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Remediation

Install update from vendor's website.

References

• https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html