# CVE-2026-45699: netatalk: Netatalk is a Free and Open Source file server suite for Unix-like operating systems

CVE-2026-45699 is fixed in netatalk on 1 platform, first by DEBIAN-CVE-2026-45699, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-45699
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 14, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | netatalk Debian 13.5 (trixie) | 4.2.3~ds-1+deb13u2 | [DEBIAN-CVE-2026-45699](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45699.md) | May 27, 2026 |
| Linux | netatalk Debian 14 | 4.4.3~ds-1 | [DEBIAN-CVE-2026-45699](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45699.md) | May 27, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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