Vulnerability-Lookup

GHSA-4226-Q7GW-49H8

Vulnerability from github – Published: 2026-10-14 18:32 – Updated: 2026-10-14 18:32

Details

3proxy from 0.9.7 through 1.0.1, fixed in commit 206c923, contains an uninitialized stack memory disclosure vulnerability that allows unauthenticated attackers to leak stack bytes via the SOCKS4 reply path when the external-NAT option (-Ne) is configured. Attackers can send a client probe that fails the SOCKS version check to trigger a reply containing uninitialized bytes from the sin structure, exposing high bytes of a userspace pointer that weakens ASLR protections.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-109438"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-14T16:17:36Z",
    "severity": "MODERATE"
  },
  "details": "3proxy from 0.9.7 through 1.0.1, fixed in commit 206c923, contains an uninitialized stack memory disclosure vulnerability that allows unauthenticated attackers to leak stack bytes via the SOCKS4 reply path when the external-NAT option (-Ne) is configured. Attackers can send a client probe that fails the SOCKS version check to trigger a reply containing uninitialized bytes from the sin structure, exposing high bytes of a userspace pointer that weakens ASLR protections.",
  "id": "GHSA-4226-q7gw-49h8",
  "modified": "2026-10-14T18:32:17Z",
  "published": "2026-10-14T18:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109438"
    },
    {
      "type": "WEB",
      "url": "https://github.com/3proxy/3proxy/commit/206c923d6cd433bd2e7196375442650c328b8bfa"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/3proxy-uninitialized-stack-memory-disclosure-via-socks4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-109438 (GCVE-0-2026-109438)

Vulnerability from cvelistv5 – Published: 2026-10-14 15:53 – Updated: 2026-10-15 19:02 X_Open Source

Title

3proxy 0.9.7 - 1.0.1 Uninitialized Stack Memory Disclosure via SOCKS4

Summary

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 19:01 UTC

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6249 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/3proxy/3proxy/commit/206c923d6…	patchissue-tracking
https://www.vulncheck.com/advisories/3proxy-unini…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
3proxy	3proxy	Affected: 0.9.7 , ≤ 1.0.1 (semver) Unaffected: 206c923d6cd433bd2e7196375442650c328b8bfa (git)

Date Public

2026-10-12 00:00

Credits

Sam Barker of VulnCheck

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-109438",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T19:01:44.310730Z",
                "version": "2.0.3"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/3proxy/3proxy",
          "product": "3proxy",
          "repo": "https://github.com/3proxy/3proxy",
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              "lessThanOrEqual": "1.0.1",
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            },
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              "version": "206c923d6cd433bd2e7196375442650c328b8bfa",
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            }
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      ],
      "credits": [
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          "type": "finder",
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      "descriptions": [
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        }
      ],
      "metrics": [
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            "vulnAvailabilityImpact": "NONE",
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            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "providerMetadata": {
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  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
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    "datePublished": "2026-10-14T15:53:36.065Z",
    "dateReserved": "2026-10-12T15:52:36.682Z",
    "dateUpdated": "2026-10-15T19:02:26.057Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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