Threats Tagged 'cve-2026-20339'

This security update for ClamAV addresses multiple vulnerabilities including improper boundary checks, invalid memory frees, integer overflows and underflows, out-of-bounds reads/writes, path traversal, and thread-safety issues. These flaws affect various parsers such as ZIP, PESpin, GPT partition names, PDF hex strings, Mach-O files, XAR, and OneNote notebooks. The update also fixes issues related to NTFS alternate data stream handling on Windows and improves thread safety and resource management in the daemon and cryptographic components.

A path traversal vulnerability affecting the Windows version of WinRAR allows the attackers to execute arbitrary code by crafting malicious archive files. This vulnerability was exploited in the wild and was discovered by Anton Cherepanov, Peter Košinár, and Peter Strýček from ESET.

HighVulnerabilityBritish Indian Ocean TerritoryIndiaIndonesia+4#cve#cve-2025-8088#cwe-35

CVE-2026-20339 is a high-severity vulnerability in the PESpin file format parser of ClamAV. It allows an unauthenticated, remote attacker to cause a denial-of-service (DoS) condition by exploiting improper boundary checks that lead to an integer overflow during file scanning. The attacker can trigger this by submitting a crafted PESpin file to ClamAV, causing the scanning process to terminate unexpectedly.

A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.