Netatalk up to 4.4.2 copydir stack-based overflow

Summaryinfo

A vulnerability was found in Netatalk up to 4.4.2. It has been rated as critical. This affects the function copydir. Performing a manipulation results in stack-based overflow. This vulnerability is identified as CVE-2026-45699. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Netatalk up to 4.4.2. This affects the function copydir. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Netatalk is a Free and Open Source file server suite for Unix-like operating systems. In versions 3.1.19 through 4.4.2, a stack-based buffer overflow exists in the copydir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. copydir() is a utility function called when a file operation crosses a device boundary inside an AFP shared volume, which the standard library's renameat() cannot handle. The function attempts to track available buffer space using srem and drem for source and destination paths. Incorrect arithmetic causes both srem and drem to underflow to SIZE_MAX. Consequently, boundary checks against strlen(de->d_name) always pass, allowing strcpy() to append filenames into nearly full stack buffers. Version 4.4.3 patches the issue. As a workaround, configure each AFP shared volume to be structured as a single file system, in other words no subdirectory of a shared volume should be a mount point for a different file system.

The advisory is shared at sourceforge.net. This vulnerability is uniquely identified as CVE-2026-45699. The exploitability is told to be easy. Technical details are known, but no exploit is available.

Upgrading to version 4.4.3 eliminates this vulnerability. The upgrade is hosted for download at netatalk.io.

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Productinfo

Name

• Netatalk

Version

• 4.4.0
• 4.4.1
• 4.4.2

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CPE 2.2info

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