Out-of-bounds write in Netatalk - CVE-2026-103933
Published: November 9, 2026
Vulnerability identifier: #VU162853
CSH Severity: Low
CVSS v4: 7.7 [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]
CVE-ID: CVE-2026-103933
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated remote attacker to execute arbitrary code as root in Netatalk's afpd daemon in root-started deployments.
The vulnerability exists due to missing bounds checks in the AppleDouble extended-attribute backend when ea = ad and FPGetExtAttr supplies an undersized MaxReplySize. An authenticated remote attacker with AFP access to the target object can trigger a memory overwrite using a malformed sidecar already present or created through a separate write path, hijacking execution.
Affected software
Netatalk
How to mitigate CVE-2026-103933
Install security update from vendor's website.
Netatalk - update to 4.5.2