Integer underflow in Netatalk - CVE-2026-45355
Published: July 12, 2026
Vulnerability identifier: #VU137329
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45355
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 disclose sensitive information and cause a denial of service.
The vulnerability exists due to integer underflow in sl_unpack_cpx when processing Spotlight RPC string unmarshalling fields. A remote user can send a specially crafted Spotlight RPC request to disclose sensitive information and cause a denial of service.
The issue occurs when a negative signed string length is implicitly cast to an unsigned size_t value, leading to a massive heap out-of-bounds read. The vulnerable request is reachable through a post-auth AFP command, and the UTF-16 string path may expose more memory than the plain string path.
How to mitigate CVE-2026-45355
Install security update from vendor's website.