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AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (securin).
CVSS VectorVendor: securin
Lifecycle Timeline
1DescriptionCVE.org
In Netatalk 1.5.0 through 4.4.2, integer underflow in dsi_writeinit() leads to denial of service. Fixed in 4.4.3.
AnalysisAI
Denial of service in Netatalk versions 1.5.0 through 4.4.2 allows remote unauthenticated attackers to crash the AFP (Apple Filing Protocol) service by exploiting an integer underflow in the dsi_writeinit() function. The flaw is network-reachable with low complexity (CVSS 7.5, AV:N/AC:L/PR:N) and no public exploit identified at time of analysis, though the trivial trigger conditions make exploitation straightforward once a proof-of-concept emerges. Netatalk has resolved the issue in version 4.4.3.
Technical ContextAI
Netatalk is an open-source implementation of the Apple Filing Protocol (AFP) suite, providing file and print services to macOS clients over TCP and historically AppleTalk; it is widely deployed on Linux/BSD NAS appliances and file servers. The Data Stream Interface (DSI) layer wraps AFP messages over TCP, and dsi_writeinit() is part of the routine that initializes the outbound write buffer for DSI packets. The root cause class (CWE-191, Integer Underflow / Wraparound) means an arithmetic operation on a length or size variable drops below zero and wraps to a large unsigned value, leading to out-of-bounds memory operations or invalid buffer state that crashes the daemon. The affected CPE cpe:2.3:a:netatalk:netatalk covers all branches up to and including the 4.4.2 release line.
RemediationAI
Vendor-released patch: Netatalk 4.4.3 - upgrade all instances from any 1.5.0-4.4.2 release to 4.4.3 or later, following the upstream advisory at https://netatalk.io/security/CVE-2026-44060. If immediate patching is not possible, restrict network exposure of the AFP/DSI service (TCP/548) to trusted management networks via host or perimeter firewall rules, which prevents unauthenticated remote triggers at the cost of denying legitimate remote macOS clients on other networks. Where AFP is no longer required because macOS clients have migrated to SMB, disable the afpd service entirely - this fully eliminates the attack surface but breaks any remaining AFP-dependent Time Machine or legacy Finder mounts. For NAS appliances, consult the vendor (e.g., Synology DSM, QNAP QTS, Asustor ADM) for a firmware release that incorporates Netatalk 4.4.3.
Netatalk before 3.1.12 is vulnerable to an out of bounds write in dsi_opensess.c. Rated critical severity (CVSS 9.8), th
Netatalk through 3.1.13 has an afp_getappl heap-based buffer overflow resulting in code execution via a crafted .appl fi
Heap buffer overflow in the Netatalk cnid_metad daemon's comm_rcv() function allows remote attackers with low-level priv
A Type Confusion vulnerability was found in the Spotlight RPC functions in afpd in Netatalk 3.1.x before 3.1.17. Rated c
The combination of primitives offered by SMB and AFP in their default configuration allows the arbitrary writing of file
Stack-based buffer overflow in Netatalk versions 2.0.4 through 4.4.2 allows authenticated remote attackers to corrupt me
SQL injection in Netatalk 3.1.0 through 4.4.2 allows authenticated remote attackers to compromise the MySQL-backed CNID
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology Dis
Arbitrary file read in Netatalk 3.0.2 through 4.4.2 allows authenticated remote attackers to create attacker-controlled
Path traversal via extended attribute (ea) handling in Netatalk 2.1.0 through 4.4.2 allows authenticated remote attacker
Shell injection in Netatalk 3.1.4 through 4.4.2 allows authenticated remote attackers to execute arbitrary OS commands t
Out-of-bounds write in Netatalk versions 2.0.4 through 4.4.2 stems from a missing o_len bounds check in the pull_charset
Same weakness CWE-191 – Integer Underflow
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 12 SP5 | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | Fixed |
| SUSE Linux Enterprise Desktop 12 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP1 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP2 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP3 | Fixed |
| SUSE Linux Enterprise Desktop 12 SP4 | Fixed |
| SUSE Linux Enterprise Server 12 | Fixed |
| SUSE Linux Enterprise Server 12 SP1 | Fixed |
| SUSE Linux Enterprise Server 12 SP2 | Fixed |
| SUSE Linux Enterprise Server 12 SP3 | Fixed |
| SUSE Linux Enterprise Server 12 SP4 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP1 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP1 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP2 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP3 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP4 | Fixed |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 SP1 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 SP2 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 SP3 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 SP4 | Fixed |
| SUSE Linux Enterprise Workstation Extension 12 SP5 | Fixed |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-31237
GHSA-9vrg-f3g5-fg4c