Integer overflow in FreeBSD - CVE-2026-49430
Published: July 1, 2026
Vulnerability identifier: #VU136009
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49430
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to improper integer truncation in the ZFS_IOC_RECV_NEW ioctl when handling a crafted receive stream in heal mode. A local user can send a crafted receive stream to cause memory corruption.
Exploitation requires the delegated ZFS permission "receive" and the heal receive path.
How to mitigate CVE-2026-49430
Install security update from vendor's website.