7.5
HIGH
CVSS 3.1
CVE-2026-20348
ClamAV XAR File Format Processing Memory Corruption Vulnerability
Overview
Description
A vulnerability in the XAR 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 XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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.
Details
INFO
Published Date :
Aug. 7, 2026, 5:17 p.m.
Last Modified :
Aug. 7, 2026, 5:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
Update ClamAV to a patched version to fix memory corruption and DoS vulnerabilities.
- Update ClamAV to the latest stable version.
- Apply vendor patches for the XAR parser.
- Scan files carefully for malicious content.
- Monitor ClamAV service for stability.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20348.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20348 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20348
weaknesses.
CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call
CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities
CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables
CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow
CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow
CAPEC-42: MIME Conversion MIME Conversion
CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File
CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links
CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags
CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion
CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog()
CAPEC-92: Forced Integer Overflow Forced Integer Overflow
CAPEC-100: Overflow Buffers Overflow Buffers
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20348 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-20348 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 07, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cisco', 'product': 'Cisco Secure Endpoint', 'versions': [{'status': 'affected', 'version': '7.0.5'}, {'status': 'affected', 'version': '6.2.19'}, {'status': 'affected', 'version': '7.3.3'}, {'status': 'affected', 'version': '7.2.13'}, {'status': 'affected', 'version': '6.1.5'}, {'status': 'affected', 'version': '6.3.1'}, {'status': 'affected', 'version': '6.2.5'}, {'status': 'affected', 'version': '7.3.5'}, {'status': 'affected', 'version': '6.2.1'}, {'status': 'affected', 'version': '7.2.7'}, {'status': 'affected', 'version': '7.1.1'}, {'status': 'affected', 'version': '6.3.5'}, {'status': 'affected', 'version': '6.2.9'}, {'status': 'affected', 'version': '7.3.1'}, {'status': 'affected', 'version': '6.1.7'}, {'status': 'affected', 'version': '7.2.11'}, {'status': 'affected', 'version': '7.2.3'}, {'status': 'affected', 'version': '7.1.5'}, {'status': 'affected', 'version': '6.3.3'}, {'status': 'affected', 'version': '7.3.9'}, {'status': 'affected', 'version': '6.2.3'}, {'status': 'affected', 'version': '6.1.9'}, {'status': 'affected', 'version': '6.0.9'}, {'status': 'affected', 'version': '7.2.5'}, {'status': 'affected', 'version': '6.0.7'}, {'status': 'affected', 'version': '6.3.7'}, {'status': 'affected', 'version': '1.12.3'}, {'status': 'affected', 'version': '1.8.0'}, {'status': 'affected', 'version': '1.11.1'}, {'status': 'affected', 'version': '1.12.4'}, {'status': 'affected', 'version': '1.10.0'}, {'status': 'affected', 'version': '1.12.0'}, {'status': 'affected', 'version': '1.8.1'}, {'status': 'affected', 'version': '1.10.1'}, {'status': 'affected', 'version': '1.12.1'}, {'status': 'affected', 'version': '1.12.6'}, {'status': 'affected', 'version': '1.14.0'}, {'status': 'affected', 'version': '1.10.2'}, {'status': 'affected', 'version': '1.12.7'}, {'status': 'affected', 'version': '1.12.2'}, {'status': 'affected', 'version': '1.6.0'}, {'status': 'affected', 'version': '1.9.0'}, {'status': 'affected', 'version': '1.11.0'}, {'status': 'affected', 'version': '1.7.0'}, {'status': 'affected', 'version': '1.13.0'}, {'status': 'affected', 'version': '1.8.4'}, {'status': 'affected', 'version': '1.13.1'}, {'status': 'affected', 'version': '1.9.1'}, {'status': 'affected', 'version': '1.12.5'}, {'status': 'affected', 'version': '1.13.2'}, {'status': 'affected', 'version': '8.1.7.21512'}, {'status': 'affected', 'version': '8.1.7'}, {'status': 'affected', 'version': '8.1.5'}, {'status': 'affected', 'version': '8.1.3.21242'}, {'status': 'affected', 'version': '8.1.3'}, {'status': 'affected', 'version': '8.1.5.21322'}, {'status': 'affected', 'version': '8.1.7.21417'}, {'status': 'affected', 'version': '1.14.1'}, {'status': 'affected', 'version': '1.15.1'}, {'status': 'affected', 'version': '1.15.2'}, {'status': 'affected', 'version': '1.15.3'}, {'status': 'affected', 'version': '1.15.4'}, {'status': 'affected', 'version': '1.15.5'}, {'status': 'affected', 'version': '1.15.6'}, {'status': 'affected', 'version': '1.16.0'}, {'status': 'affected', 'version': '1.16.1'}, {'status': 'affected', 'version': '1.16.2'}, {'status': 'affected', 'version': '1.16.3'}, {'status': 'affected', 'version': '1.18.0'}, {'status': 'affected', 'version': '1.18.1'}, {'status': 'affected', 'version': '1.20.0'}, {'status': 'affected', 'version': '1.21.0'}, {'status': 'affected', 'version': '1.21.1'}, {'status': 'affected', 'version': '1.21.2'}, {'status': 'affected', 'version': '1.21.3'}, {'status': 'affected', 'version': '1.22.0'}, {'status': 'affected', 'version': '1.22.1'}, {'status': 'affected', 'version': '1.22.2'}, {'status': 'affected', 'version': '1.22.3'}, {'status': 'affected', 'version': '1.22.4'}, {'status': 'affected', 'version': '1.24.0'}, {'status': 'affected', 'version': '1.24.1'}, {'status': 'affected', 'version': '1.24.2'}, {'status': 'affected', 'version': '1.24.3'}, {'status': 'affected', 'version': '1.24.4'}, {'status': 'affected', 'version': '1.26.0'}, {'status': 'affected', 'version': '1.24.5'}, {'status': 'affected', 'version': '1.26.1'}, {'status': 'affected', 'version': '1.27.0'}, {'status': 'affected', 'version': '1.15.0'}, {'status': 'affected', 'version': '1.17.0'}, {'status': 'affected', 'version': '1.17.1'}, {'status': 'affected', 'version': '1.17.2'}, {'status': 'affected', 'version': '1.19.0'}, {'status': 'affected', 'version': '1.20.1'}, {'status': 'affected', 'version': '1.20.2'}, {'status': 'affected', 'version': '1.20.3'}, {'status': 'affected', 'version': '1.20.4'}, {'status': 'affected', 'version': '1.20.5'}, {'status': 'affected', 'version': '1.20.6'}, {'status': 'affected', 'version': '1.23.0'}, {'status': 'affected', 'version': '1.23.1'}, {'status': 'affected', 'version': '1.20.7'}, {'status': 'affected', 'version': '1.20.8'}, {'status': 'affected', 'version': '1.25.0'}, {'status': 'affected', 'version': '1.25.1'}, {'status': 'affected', 'version': '1.25.2'}, {'status': 'affected', 'version': '1.27.1'}, {'status': 'affected', 'version': '1.27.2'}, {'status': 'affected', 'version': '7.3.13'}, {'status': 'affected', 'version': '7.3.15'}, {'status': 'affected', 'version': '7.4.1'}, {'status': 'affected', 'version': '7.4.1.20425'}, {'status': 'affected', 'version': '7.4.1.20439'}, {'status': 'affected', 'version': '7.4.3'}, {'status': 'affected', 'version': '7.4.3.20679'}, {'status': 'affected', 'version': '7.4.5'}, {'status': 'affected', 'version': '7.5.1.20813'}, {'status': 'affected', 'version': '7.5.1.20833'}, {'status': 'affected', 'version': '7.5.3'}, {'status': 'affected', 'version': '7.5.5'}, {'status': 'affected', 'version': '8.0.1.21160'}, {'status': 'affected', 'version': '8.0.1.21164'}, {'status': 'affected', 'version': '7.5.7'}, {'status': 'affected', 'version': '7.5.9'}, {'status': 'affected', 'version': '7.5.11'}, {'status': 'affected', 'version': '8.1.7.21585'}, {'status': 'affected', 'version': '7.5.13.21586'}, {'status': 'affected', 'version': '7.5.13.21598'}, {'status': 'affected', 'version': '8.2.1.21612'}, {'status': 'affected', 'version': '8.2.1.21650'}, {'status': 'affected', 'version': '7.5.15.21611'}, {'status': 'affected', 'version': '7.5.17.21680'}, {'status': 'affected', 'version': '8.2.3.30119'}, {'status': 'affected', 'version': '8.2.4.30130'}, {'status': 'affected', 'version': '8.4.0'}, {'status': 'affected', 'version': '7.5.19'}, {'status': 'affected', 'version': '8.4.1.30298'}, {'status': 'affected', 'version': '8.4.2.30317'}, {'status': 'affected', 'version': '8.4.1.30307'}, {'status': 'affected', 'version': '7.5.20'}, {'status': 'affected', 'version': '8.4.3'}, {'status': 'affected', 'version': '8.4.4.30419'}, {'status': 'affected', 'version': '8.4.4.30467'}, {'status': 'affected', 'version': '7.5.21.21732'}, {'status': 'affected', 'version': '8.4.5.30483'}], 'defaultStatus': 'unknown'}] Added Description A vulnerability in the XAR 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 XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-120 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.