Integer underflow in Netatalk - CVE-2026-45698
Published: July 12, 2026
Vulnerability identifier: #VU137325
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-2026-45698
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 or cause a denial of service.
The vulnerability exists due to integer underflow in deletedir() in the afpd daemon when processing file operations that cross a device boundary inside an AFP shared volume. A remote user can provide a crafted filename to trigger a stack-based buffer overflow and execute arbitrary code or cause a denial of service.
The overflow occurs because an unsigned remaining-size calculation wraps to SIZE_MAX, causing a subsequent bounds check to always evaluate as safe before strcpy() copies attacker-controlled data into a nearly full stack buffer.
How to mitigate CVE-2026-45698
Install security update from vendor's website.