Incorrect calculation in PCL - CVE-2025-4638
Published: July 7, 2025
Vulnerability identifier: #VU112439
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-4638
CWE-ID: CWE-682
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to usage of a vulnerable version of the inftrees.c component from the zlib library. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
Affected software
PCL
Fedora
zsync
zlib (Red Hat package)
Fedora
zsync
zlib (Red Hat package)
How to mitigate CVE-2025-4638
Install updates from vendor's website.
PCL - update to 1.14.0
zsync - addressed in versions 0.6.2-3.el9, 0.6.2-3.fc41, 0.6.2-3.fc42, 0.6.2-3.fc43
zlib (Red Hat package) - update to 1.2.7-21.el7_9.1
zsync - addressed in versions 0.6.2-3.el9, 0.6.2-3.fc41, 0.6.2-3.fc42, 0.6.2-3.fc43
zlib (Red Hat package) - update to 1.2.7-21.el7_9.1