CVE-2026-20348: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
A vulnerability in the XAR file format parser of ClamAV allows an unauthenticated remote attacker to cause a denial-of-service (DoS) condition by triggering memory corruption during file scanning. The issue arises from improper boundary checks on XAR file content, which can cause the ClamAV scanning process to terminate unexpectedly.
AI Analysis
Technical Summary
CVE-2026-20348 is a high-severity vulnerability in ClamAV's XAR file format parser caused by improper boundary checks during scanning. An attacker can exploit this by submitting a crafted XAR file to ClamAV, leading to memory corruption and termination of the scanning process, resulting in a denial-of-service condition. The vulnerability does not impact confidentiality or integrity but affects availability by crashing the scanning service.
Potential Impact
Successful exploitation results in denial of service by causing the ClamAV scanning process to terminate unexpectedly. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time.
CVE-2026-20348: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Cisco Cisco Secure Endpoint
Description
A vulnerability in the XAR file format parser of ClamAV allows an unauthenticated remote attacker to cause a denial-of-service (DoS) condition by triggering memory corruption during file scanning. The issue arises from improper boundary checks on XAR file content, which can cause the ClamAV scanning process to terminate unexpectedly.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-20348 is a high-severity vulnerability in ClamAV's XAR file format parser caused by improper boundary checks during scanning. An attacker can exploit this by submitting a crafted XAR file to ClamAV, leading to memory corruption and termination of the scanning process, resulting in a denial-of-service condition. The vulnerability does not impact confidentiality or integrity but affects availability by crashing the scanning service.
Potential Impact
Successful exploitation results in denial of service by causing the ClamAV scanning process to terminate unexpectedly. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-r446-3hx7-79p2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-20348"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7742a1bf8831d539b084f7
Added to database: 08/08/2026, 14:52:17 UTC
Last enriched: 08/08/2026, 15:16:09 UTC
Last updated: 08/09/2026, 03:40:59 UTC
Views: 2
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