Service interruption via wrapped DSI payload size
Published May 21, 2026 · Updated May 21, 2026
Integer underflow in Netatalk 1.5.0 through 4.4.2 allows remote attackers to interrupt AFP service via a crafted DSI write request. The dsi_writeinit() function subtracts an attacker-controlled data offset from the declared DSI length without checking their order, wrapping the payload size to nearly 4 GB. A pre-authentication desynchronization chain reaches the path; holding repeated connections open blocks afpd children and can exhaust process limits, without memory corruption or code execution.
Summary
What happened
Integer underflow in Netatalk 1.5.0 through 4.4.2 allows remote attackers to interrupt AFP service via a crafted DSI write request. The dsi_writeinit() function subtracts an attacker-controlled data offset from the declared DSI length without checking their order, wrapping the payload size to nearly 4 GB. A pre-authentication desynchronization chain reaches the path; holding repeated connections open blocks afpd children and can exhaust process limits, without memory corruption or code execution.
The record
- CVE
- CVE-2026-44060
- Published
- May 21, 2026
- Updated
- May 21, 2026
- Vendor
- Netatalk
- Product
- Netatalk
- Classifications
- CWE-191, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 21, 2026CVE publishedPublication date reported by the CVE source.
- May 21, 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.
- Affected versionversion=1.5.0 <=4.4.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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