SB2025070765 - Fedora 43 update for zsync
Published: July 7, 2025
Security Bulletin ID
SB2025070765
Severity
Medium
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Denial of service (CVE-ID: CVE-2016-9840)
The vulnerability allows a remote attacker to cause DoS condition on the target system.The weakness exists in zlib due to out-of-bounds pointer arithmetic in inftrees.c. A remote attacker can send a specially crafted document, trick the victim into opening it, and cause the application to crash.
Successful exploitation of the vulnerability results in denial of service.
2) Incorrect calculation (CVE-ID: CVE-2025-4638)
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.
Remediation
Install update from vendor's website.