CVE detail
CVE-2026-20339
A vulnerability in the PESpin 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 PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin 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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 16.1 · diversity 16.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 4
- within the 30d window
- Peak daily
- 2
- highest bucket
Evidence
Source links by recency
4 source links · newest first
- ClamAV Vulnerabilities Affecting Cisco Products: August 2026Cisco Security Advisories
apps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26 Security Impact Rating: High CVE: CVE-2026-20337,CVE-2026-20338,CVE-2026-20339,CVE-2026-20345,CVE-2026-20346,CVE-2026-20347,CVE-2026-20348
vendorsec.cloudapps.cisco.comAug 13, 2026, 8:11 PM - Cisco Warns of Seven ClamAV Flaws, Two With Public PoCsSecurity Affairs
ause a denial of service (DoS) condition, interrupting scanning operations.” reads the advisory . The flaws, tracked as CVE-2026-20337 to CVE-2026-20339 and CVE-2026-20345 to CVE-2026-20348, affect ClamAV parsers for several file formats. ClamAV fixed them in version 1.5.4 , Cisco later warned that public PoCs are available for the vulnerabilities CVE-
newssecurityaffairs.comAug 11, 2026, 4:05 PM Information published.
vendormsrc.microsoft.comAug 11, 2026, 8:17 AM- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26sec.cloudapps.cisco.com
No excerpt available.
Vendor Advisorysec.cloudapps.cisco.comAug 7, 2026, 5:17 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
Related records
Similar CVEs
6 related CVEs with shared weakness or product evidence
- CVE-2026-73193CVSS N/A · Unrated
DBI versions before 1.652 for Perl allow a heap out-of-bounds write on 32-bit perl via an integer wraparound in the output buffer size computed by preparse. preparse reserves its…
- CVE-2026-18671CVSS 6.5 · Medium
IBM i 7.6, 7.5, 7.4, and 7.3 could allow an authenticated attacker to force a NetServer server thread exception, caused by an integer overflow during bounds checking in request pr…
- CVE-2026-17216CVSS 5.3 · Medium
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to an integer error when processing DRDA large-object headers.
- CVE-2026-73645CVSS 6.6 · Medium
OpenZeppelin Confidential Contracts is an experimental library for developing applications on the Zama fhEVM. Prior to 0.3.1, the ERC7984 contract tracked confidential total suppl…
- CVE-2026-73564CVSS 8.7 · High
frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-control…
- CVE-2026-55400CVSS 6.0 · Medium
CVE-2026-55400 is an integer underflow in Secure Access servers prior to version 14.57. Attackers with an authenticated session can send specially crafted traffic to a server in…