Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M
CVE-2026-45698Netatalk has Integer Underflow → Stack Buffer Overflow in deletedir()
High 7.5
In plain English
A high-severity security flaw in netatalk from Netatalk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 deletedir() function of Netatalk's afpd daemon due to an integer underflow in the calculation of the remaining buffer size used for path construction. deletedir() 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 prevent buffer overflows by tracking available space in a size_t remain variable. However, the arithmetic used to compute remain results in an unsigned integer underflow, causing the variable to become SIZE_MAX. Because of this, the subsequent boundary check always evaluates as safe, allowing an unbounded strcpy() operation to copy attacker-controlled filenames into a nearly full stack buffer. Version 4.4.3 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | netatalk | 4.4.3-r0 | ALPINE-CVE-2026-45698 |
| Debian:13 | netatalk | 4.2.3~ds-1+deb13u2 | DEBIAN-CVE-2026-45698 |
| Debian:14 | netatalk | 4.4.3~ds-1 | DEBIAN-CVE-2026-45698 |
| Ubuntu:25.10 | netatalk | no fix listed | UBUNTU-CVE-2026-45698 |
| Ubuntu:26.04:LTS | netatalk | no fix listed | UBUNTU-CVE-2026-45698 |
| Ubuntu:26.10 | netatalk | no fix listed | UBUNTU-CVE-2026-45698 |
Affected products (as reported)
Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/Netatalk/netatalk/security/advisories/GHSA-5443-v9xg-mqgv x_refsource_CONFIRM
- https://github.com/Netatalk/netatalk/releases/tag/netatalk-4-4-3 x_refsource_MISC