CVE-2026-20338: Double Free in Cisco Cisco Secure Endpoint
A vulnerability in the zip archive parser of ClamAV allows an unauthenticated remote attacker to cause a denial-of-service (DoS) condition by submitting a crafted zip file. The issue arises from improper memory handling leading to a double-free error during scanning, which terminates the ClamAV scanning process.
AI Analysis
Technical Summary
CVE-2026-20338 is a high-severity vulnerability in ClamAV's zip archive parser caused by improper memory handling when processing zip file contents. An attacker can exploit this by submitting a specially crafted zip file for scanning, triggering a memory double-free that causes the ClamAV scanning process to crash, resulting in a denial-of-service condition. The vulnerability does not impact confidentiality or integrity but affects availability by terminating the scanning service.
Potential Impact
Successful exploitation results in a denial-of-service condition on the affected device by crashing the ClamAV scanning process. There is no impact on confidentiality or integrity of data. The vulnerability can be triggered remotely without authentication by submitting malicious zip files for scanning.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting or monitoring the submission of zip files for scanning to reduce exposure to crafted malicious archives.
CVE-2026-20338: Double Free in Cisco Cisco Secure Endpoint
Description
A vulnerability in the zip archive parser of ClamAV allows an unauthenticated remote attacker to cause a denial-of-service (DoS) condition by submitting a crafted zip file. The issue arises from improper memory handling leading to a double-free error during scanning, which terminates the ClamAV scanning process.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-20338 is a high-severity vulnerability in ClamAV's zip archive parser caused by improper memory handling when processing zip file contents. An attacker can exploit this by submitting a specially crafted zip file for scanning, triggering a memory double-free that causes the ClamAV scanning process to crash, resulting in a denial-of-service condition. The vulnerability does not impact confidentiality or integrity but affects availability by terminating the scanning service.
Potential Impact
Successful exploitation results in a denial-of-service condition on the affected device by crashing the ClamAV scanning process. There is no impact on confidentiality or integrity of data. The vulnerability can be triggered remotely without authentication by submitting malicious zip files for scanning.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider restricting or monitoring the submission of zip files for scanning to reduce exposure to crafted malicious archives.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-xw98-8fcm-j8x7
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-20338"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7742a1bf8831d539b084f3
Added to database: 08/08/2026, 14:52:17 UTC
Last enriched: 08/08/2026, 15:16:02 UTC
Last updated: 08/09/2026, 03:40:59 UTC
Views: 3
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