ClamAV Mach-O File Format Processing Memory Corruption Vulnerability
Summary
| CVE | CVE-2026-20347 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-07 17:17:03 UTC |
| Updated | 2026-08-07 22:16:58 UTC |
| Description | A vulnerability in the Mach-O 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 Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Problem Types: CWE-125 | CWE-125 Out-of-bounds Read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSSV3_1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco Secure Endpoint | affected 7.0.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.2.19 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.2.13 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.1.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.3.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.2.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.2.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.2.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.1.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.3.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.2.9 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.1.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.2.11 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.2.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.1.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.3.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.9 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.2.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.1.9 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.0.9 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.2.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.0.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 6.3.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.8.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.11.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.10.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.8.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.10.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.6 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.14.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.10.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.6.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.9.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.11.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.7.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.13.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.8.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.13.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.9.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.12.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.13.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.0.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.1.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.0.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.0.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.7.21512 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.3.21242 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.5.21322 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.7.21417 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.1.0.14 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.2.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.3.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.4.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.5.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.6.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.7.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.8.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.9.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.10.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.10.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 2.11.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.14.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.6 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.16.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.16.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.16.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.16.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.18.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.18.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.21.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.21.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.21.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.21.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.22.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.22.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.22.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.22.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.22.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.26.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.24.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.26.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.27.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.15.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.17.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.17.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.17.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.19.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.4 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.6 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.23.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.23.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.20.8 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.25.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.25.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.25.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.27.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 1.27.2 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.13 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.3.15 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.1 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.1.20425 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.1.20439 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.3.20679 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.4.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.1.20813 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.1.20833 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.5 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.0.1.21160 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.0.1.21164 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.7 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.9 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.11 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.1.7.21585 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.13.21586 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.13.21598 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.2.1.21612 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.2.1.21650 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.15.21611 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.17.21680 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.2.3.30119 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.2.4.30130 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.0 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.19 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.1.30298 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.2.30317 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.1.30307 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.20 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.3 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.4.30419 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.4.30467 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 7.5.21.21732 | Not specified |
| CNA | Cisco | Cisco Secure Endpoint | affected 8.4.5.30483 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav... | [email protected] | sec.cloudapps.cisco.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Exploits
CNA: The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338. The Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.
There are currently no legacy QID mappings associated with this CVE.