Bug 2373726 (CVE-2025-20260)

Summary: CVE-2025-20260 clamav: ClamAV PDF Scanning Buffer Overflow Vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: urgent Docs Contact:
Priority: urgent    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A vulnerability has been discovered in the PDF parsing engine of ClamAV. This flaw can be exploited to achieve remote code execution (RCE). Given that ClamAV is routinely used to process untrusted input (for example, email attachments and downloaded files), a malicious PDF document could trigger this vulnerability, allowing an attacker to execute arbitrary code on the system running ClamAV.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2373744, 2373746, 2373747, 2373749, 2373750, 2373752, 2373753, 2373756, 2373757, 2373745, 2373748, 2373751, 2373754, 2373755    
Bug Blocks:    

Description OSIDB Bzimport 2025-06-18 18:01:13 UTC 
A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device.

This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process.