Vulnerability-Lookup

CVE-2026-33592 (GCVE-0-2026-33592)

Vulnerability from cvelistv5 – Published: 2026-07-02 07:12 – Updated: 2026-07-02 12:30

Title

FindServers Memory Exhaustion in open62541

Summary

An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of resources without limits or throttling
CWE-789 - Memory allocation with excessive size value

Assigner

ENISA

References

3 references

URL	Tags
https://github.com/open62541/open62541/pull/8142	patch
https://github.com/open62541/open62541/pull/8142/…	patch
https://github.com/open62541/open62541	product

Impacted products

1 product

Vendor	Product	Version
open62541 project / o6 Automation GmbH	open62541	Affected: 1.4.0 , ≤ 1.4.16 (semver) Affected: 1.5.0 , ≤ 1.5.4 (semver) Affected: master (custom)

Credits

Lorenzo Cannella from Fondazione Ugo Bordoni (FUB)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33592

Vulnerability from fkie_nvd - Published: 2026-07-02 08:16 - Updated: 2026-07-02 17:39

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	a6d3dc9e-0591-4a13-bce7-0f5b31ff6158	https://github.com/open62541/open62541
	a6d3dc9e-0591-4a13-bce7-0f5b31ff6158	https://github.com/open62541/open62541/pull/8142
	a6d3dc9e-0591-4a13-bce7-0f5b31ff6158	https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "open62541",
          "vendor": "open62541 project / o6 Automation GmbH",
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              "lessThanOrEqual": "1.5.4",
              "status": "affected",
              "version": "1.5.0",
              "versionType": "semver"
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            {
              "status": "affected",
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              "versionType": "custom"
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    }
  ],
  "id": "CVE-2026-33592",
  "lastModified": "2026-07-02T17:39:07.620",
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          "attackVector": "NETWORK",
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          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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GHSA-R94M-59FW-HM34

Vulnerability from github – Published: 2026-07-02 09:32 – Updated: 2026-07-02 09:32

Details

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-33592"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-02T08:16:39Z",
    "severity": "HIGH"
  },
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  "id": "GHSA-r94m-59fw-hm34",
  "modified": "2026-07-02T09:32:03Z",
  "published": "2026-07-02T09:32:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33592"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8142"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open62541/open62541"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-33592 (GCVE-0-2026-33592)

FKIE_CVE-2026-33592

GHSA-R94M-59FW-HM34

Tags

Sightings

Nomenclature