CVE catalog
CVE-2026-20347
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 corrup
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.56% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | clamav | sid | 1.4.6+dfsg-1 | fixed |
| Debian | clamav | forky | 1.4.6+dfsg-1 | fixed |
| Debian | clamav | trixie | 1.4.3+dfsg-1 | vulnerable |
| Debian | clamav | bookworm | 1.4.3+dfsg-1~deb12u2 | vulnerable |
| Debian | clamav | bookworm-security | 1.4.6+dfsg-0+deb12u1 | fixed |
| Ubuntu | clamav | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-base | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-daemon | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-doc | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-docs | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-freshclam | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-milter | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav-testfiles | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamdscan | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | libclamav-dev | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | libclamav12 | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav | pro | 0.101.4+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.1+dfsg-2ubuntu2 | vulnerable |
| Ubuntu | clamav | pro | 0.102.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.2+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.3+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.102.4+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.2+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.2+dfsg-0ubuntu0.20.04.2 | vulnerable |
| Ubuntu | clamav | pro | 0.103.5+dfsg-1~20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.6+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.8+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.9+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.11+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 0.103.12+dfsg-0ubuntu0.20.04.1 | vulnerable |
| Ubuntu | clamav | pro | 1.4.3+dfsg-0ubuntu0.20.04.1+esm1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.3+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.4+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.4+dfsg-1build1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.5+dfsg-1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.6+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.8+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.9+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.11+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 0.103.12+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.4.3+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.4.4+dfsg-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.5.3+dfsg-0ubuntu0.22.04.2 | vulnerable |
| Ubuntu | clamav | 22.04 | 1.5.4+dfsg-0ubuntu0.22.04.1 | fixed |
| Ubuntu | clamav | 24.04 | 1.0.2+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.3+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.4+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1.1ubuntu2 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.5+dfsg-1.1ubuntu3 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.7+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.0.8+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.4.3+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.4.4+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.5.3+dfsg-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | clamav | 24.04 | 1.5.4+dfsg-0ubuntu0.24.04.1 | fixed |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-0ubuntu2 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-0ubuntu3 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu2 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.3+dfsg-2ubuntu3 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.4.4+dfsg-0ubuntu0.26.04.1 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.5.3+dfsg-0ubuntu0.26.04.1 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.5.3+dfsg-0ubuntu0.26.04.2 | vulnerable |
| Ubuntu | clamav | 26.04 | 1.5.4+dfsg-0ubuntu0.26.04.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | clamav | source | sid | 1.4.6+dfsg-1 | not yet assigned | Not reported | [1143939] |
| Debian | clamav | source | forky | 1.4.6+dfsg-1 | not yet assigned | Not reported | [1143939] |
| Debian | clamav | source | trixie | (unfixed) | not yet assigned | Not reported | [1143939] |
| Debian | clamav | source | bookworm | 1.4.6+dfsg-0+deb12u1 | not yet assigned | Not reported | [1143939] |
| Ubuntu | clamav | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-base | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-daemon | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-doc | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-docs | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-freshclam | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-milter | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav-testfiles | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamdscan | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | libclamav-dev | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | libclamav12 | deb | noble | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | clamav | deb | 22.04 | 1.5.4+dfsg-0ubuntu0.22.04.1 | Not reported | UBUNTU-CVE-2026-20347 | Not reported |
| Ubuntu | clamav | deb | 24.04 | 1.5.4+dfsg-0ubuntu0.24.04.1 | Not reported | UBUNTU-CVE-2026-20347 | Not reported |
| Ubuntu | clamav | deb | 26.04 | 1.5.4+dfsg-0ubuntu0.26.04.1 | Not reported | UBUNTU-CVE-2026-20347 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [clamav]Affected
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-base]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-daemon]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-doc]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-docs]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-freshclam]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-milter]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamav-testfiles]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· all · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [clamdscan]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [libclamav12]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
- [libclamav-dev]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1~deb12u2· amd64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
1.4.3+dfsg-1~deb12u2· arm64 · bookwormAffected · Fixed:
1.4.6+dfsg-0+deb12u1nvd · clamav · debian · bookworm; nvd · clamav · debian · 12
[Debian 13 (Trixie)]
- [clamav]Affected
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-base]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-daemon]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-doc]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-docs]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamav-freshclam]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-milter]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
- [clamav-testfiles]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· all · trixieAffected
nvd · clamav · debian · 13
- [clamdscan]Affected
Source package: [clamav]
Details (2)
1.4.3+dfsg-1· amd64 · trixieAffected
nvd · clamav · debian · 13
1.4.3+dfsg-1· arm64 · trixieAffected
nvd · clamav · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11583-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-20347]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-20347]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-20347]
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26]
- [https://security-tracker.debian.org/tracker/CVE-2026-20347]
- [https://ubuntu.com/security/notices/USN-8788-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2708.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]