SB2026070169 - Multiple vulnerabilities in ClamAV
Published: July 1, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 vulnerabilities.
1) Release of invalid pointer or reference (CVE-ID: CVE-2026-20217)
CWE-ID: CWE-763 - Release of invalid pointer or reference
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to invalid pointer free in the PESpin unpacker cleanup path when scanning a crafted PE file. A remote attacker can provide a specially crafted file to cause a denial of service.
2) Integer overflow (CVE-ID: CVE-2026-20213)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to integer overflow in PE rebuild size calculations when scanning a malformed Aspack-packed PE file. A remote attacker can provide a specially crafted file to execute arbitrary code.
3) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-20216)
CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper enforcement of extraction limits in InstallShield archive handling when scanning a crafted InstallShield archive. A remote attacker can provide a specially crafted archive to cause a denial of service.
The issue can exhaust temporary storage by writing far more temporary data than intended.
4) Integer underflow (CVE-ID: CVE-2026-20214)
CWE-ID: CWE-191 - Integer underflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to integer underflow in the FSG unpacker loop when scanning a malformed PE file. A remote attacker can provide a specially crafted file to execute arbitrary code.
The issue can write past the section array.
5) Input validation error (CVE-ID: CVE-2026-20243)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper size handling in the ALZ parser when parsing a malformed ALZ archive. A remote attacker can provide a specially crafted archive to cause a denial of service.
The issue may panic or abort the scanner, and it may also skip expected scan-limit handling.
6) Integer overflow (CVE-ID: CVE-2026-20215)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to integer overflow in the 7z parser substream count handling when parsing a malformed archive. A remote attacker can provide a specially crafted archive to execute arbitrary code.
The issue can under-allocate parser metadata arrays and write past them while reading the archive.
7) Input validation error (CVE-ID: CVE-2026-20244)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper size checks in the DMG parser when parsing a crafted DMG file on 32-bit builds. A remote attacker can provide a specially crafted file to cause a denial of service.
Only 32-bit scanner builds are affected.
8) Out-of-bounds write (CVE-ID: CVE-2026-41676)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a buffer overflow.
The vulnerability exists due to a heap/stack overflow in Deriver::derive and PkeyCtxRef::derive when deriving shared secrets into a caller-supplied buffer on OpenSSL 1.1.x. A remote attacker can provide or trigger use of a short buffer to cause a buffer overflow.
Only OpenSSL 1.1.x is affected; OpenSSL 3.x providers check the buffer length.
Remediation
Install update from vendor's website.