CVE-2026-52856Network attack vector

Unauthenticated daemon crash via short SFTP payload

Published Jul 31, 2026 · Updated Jul 31, 2026

Denial of service in Pterodactyl Wings before 1.13.0 allows remote attackers to crash the daemon through an SFTP handshake packet. AcceptInbound slices req.Payload at byte four without first checking its length, so a shorter subsystem request triggers a Go bounds panic. The attack requires network access to an open Wings SFTP port and interrupts the entire Wings process without reading or modifying data.

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

What happened

Denial of service in Pterodactyl Wings before 1.13.0 allows remote attackers to crash the daemon through an SFTP handshake packet. AcceptInbound slices req.Payload at byte four without first checking its length, so a shorter subsystem request triggers a Go bounds panic. The attack requires network access to an open Wings SFTP port and interrupts the entire Wings process without reading or modifying data.

The record

CVE
CVE-2026-52856
Published
Jul 31, 2026
Updated
Jul 31, 2026
Vendor
Pterodactyl
Product
Wings
Classifications
CWE-248, CWE-755, CWE-129, CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 31, 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=< 1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pterodactyl · Wingsversion=< 1.13.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
CWE-755Improper Handling of Exceptional Conditions
CWE-129Improper Validation of Array Index
CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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