CVE-2026-52856: Wings Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-ghrq-5wpp-hxx5
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CVSS 7.5
CWE-617 CWE-755 CWE-400 CWE-20 CWE-129 CWE-248
Published
Advisory Summary

CVE-2026-52856 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-617: Reachable Assertion) affecting Wings libraries in the Go ecosystem. The issue involves maliciously crafted packet during sftp connection handshake causes denial of service. Remediation is available by upgrading affected packages to version 1.13.0.

CVE-2026-52856 at a Glance

CVE Identifier CVE-2026-52856
GHSA Identifier GHSA-ghrq-5wpp-hxx5
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-617: Reachable Assertion
Affected Product Wings
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-52856

To remediate this vulnerability, upgrade all affected Wings dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/pterodactyl/wings fixed: 1.13.0 
Upgrade github.com/pterodactyl/wings to 1.13.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/pterodactyl/wings

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-52856, inspect your project dependencies for Wings:

inspect dependencies for github.com/pterodactyl/wings

Analyze the terminal output to locate any version of Wings in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.13.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-617: Reachable Assertion, where the product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. In Wings, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary A maliciously crafted packet received & parsed during the SFTP connection handshake will cause a Go panic. ### Impact All wings users with an open SFTP port. ### Workarounds Close SFTP port.

CVE-2026-52856 Affected Wings Versions

1 component(s)
Fixed Versions:
1.13.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/pterodactyl/wings
golang/github.com/pterodactyl/wings
Go
< 1.13.0
1.13.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pterodactyl/wings/security/advisories/GHSA-ghrq-5wpp-hxx5
Security Fix Commit FIX COMMIT
https://github.com/pterodactyl/wings/commit/8e49c7c0eda815d3ada171831876a1c14c493026
Wings Source Repository REPOSITORY
https://github.com/pterodactyl/wings
Wings Release RELEASE
https://github.com/pterodactyl/wings/releases/tag/v1.13.0

Frequently Asked Questions

What is CVE-2026-52856?
CVE-2026-52856 is a security vulnerability in Wings involving Maliciously crafted packet during SFTP connection handshake causes denial of service under CWE-617: Reachable Assertion.
Which Wings versions are affected?
Affected versions include releases prior to 1.13.0 across affected packages: github.com/pterodactyl/wings.
What version fixes CVE-2026-52856?
Upgrading to 1.13.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/pterodactyl/wings affected?
Yes, github.com/pterodactyl/wings is affected in releases prior to 1.13.0. Upgrade your dependency to 1.13.0 or later.
What is the CVSS score of CVE-2026-52856?
CVE-2026-52856 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-52856?
CVE-2026-52856 is classified under CWE-617: Reachable Assertion (The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.).
How can I check Go dependencies for CVE-2026-52856?
Run the dependency tree command: 'inspect dependencies for github.com/pterodactyl/wings'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ghrq-5wpp-hxx5",
  "modified" : "2026-07-31T16:20:25Z",
  "published" : "2026-07-31T16:20:25Z",
  "aliases" : [ "CVE-2026-52856" ],
  "summary" : "Wings: Maliciously crafted packet during SFTP connection handshake causes denial of service",
  "details" : "### Summary\nA maliciously crafted packet received & parsed during the SFTP connection handshake will cause a Go panic.\n\n### Impact\nAll wings users with an open SFTP port.\n\n### Workarounds\nClose SFTP port.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/pterodactyl/wings"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pterodactyl/wings/security/advisories/GHSA-ghrq-5wpp-hxx5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pterodactyl/wings/commit/8e49c7c0eda815d3ada171831876a1c14c493026"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pterodactyl/wings"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pterodactyl/wings/releases/tag/v1.13.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-129", "CWE-20", "CWE-248", "CWE-400", "CWE-617", "CWE-755" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-31T16:20:25Z",
    "nvd_published_at" : null
  }
}