CVE-2026-45699Network attack vectorHinoki check available

Authenticated code execution via copydir path underflow

Published Aug 14, 2026 · Updated Aug 14, 2026

Stack-based buffer overflow in Netatalk 3.1.19 through 4.4.2 allows remote authenticated users to crash afpd or execute code. The afpd copydir() fallback subtracts validated path lengths from current string lengths, underflowing srem and drem to SIZE_MAX so strcpy() appends overrun stack path buffers. Exploitation requires a cross-device directory move inside an AFP share; the corrupted worker can crash, while control-flow overwrite enables code execution.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stack-based buffer overflow in Netatalk 3.1.19 through 4.4.2 allows remote authenticated users to crash afpd or execute code. The afpd copydir() fallback subtracts validated path lengths from current string lengths, underflowing srem and drem to SIZE_MAX so strcpy() appends overrun stack path buffers. Exploitation requires a cross-device directory move inside an AFP share; the corrupted worker can crash, while control-flow overwrite enables code execution.

The record

CVE
CVE-2026-45699
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Netatalk
Product
Netatalk
Classifications
CWE-191, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.1.19, < 4.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Netatalk · Netatalkversion=>= 3.1.19, < 4.4.3

Published CVSS scores

7.5Netatalk GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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