Integer underflow in Netatalk - CVE-2026-45699
Published: July 12, 2026
Vulnerability identifier: #VU137324
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45699
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Netatalk
Affected software:
Netatalk
Netatalk
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to integer underflow in copydir() in the afpd daemon when handling cross-device directory rename operations inside an AFP shared volume. A remote user can trigger a crafted file operation to execute arbitrary code.
At minimum, successful exploitation can crash an afpd worker process. The issue is triggered when a file operation crosses a device boundary that the standard library renameat() cannot handle.
How to mitigate CVE-2026-45699
Install security update from vendor's website.