Vulnerability-Lookup

UBUNTU-CVE-2026-11946 (CVE-2026-11946)

Vulnerability from osv_ubuntu – Published: 2026-07-02 12:16 – Updated: 2026-07-09 15:15 – Source website

Details

An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) 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 configurations. 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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-11946	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-11946	REPORT
	https://github.com/open62541/open62541/pull/8142	REPORT
	https://github.com/open62541/open62541/commit/c95…	REPORT
	https://github.com/open62541/open62541	REPORT
	https://github.com/open62541/open62541/pull/8142/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopen62541-1.4",
            "binary_version": "1.4.11.1-1"
          },
          {
            "binary_name": "libopen62541-1.4-tools",
            "binary_version": "1.4.11.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "open62541",
        "purl": "pkg:deb/ubuntu/open62541@1.4.11.1-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.6-1",
        "1.4.11.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopen62541-1.4",
            "binary_version": "1.4.11.1-1build1"
          },
          {
            "binary_name": "libopen62541-1.4-tools",
            "binary_version": "1.4.11.1-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "open62541",
        "purl": "pkg:deb/ubuntu/open62541@1.4.11.1-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.11.1-1",
        "1.4.11.1-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) 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 configurations. The\u00a0issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.",
  "id": "UBUNTU-CVE-2026-11946",
  "modified": "2026-07-09T15:15:45Z",
  "published": "2026-07-02T12:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-11946"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-11946"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open62541/open62541/pull/8142"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open62541/open62541/commit/c9563e8ea4a8db2f64059c8ff7efe0b49a35bea3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open62541/open62541"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-11946"
  ]
}

CVE-2026-11946 (GCVE-0-2026-11946)

Vulnerability from cvelistv5 – Published: 2026-07-02 10:54 – Updated: 2026-07-02 12:15

Title

GetEndpoints Memory Exhaustion in open62541

Summary

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-07-02 12:15 UTC

CWE

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

Assigner

ENISA ENISA root Scorecard

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

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-11946",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-02T12:15:40.618622Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
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        "providerMetadata": {
          "dateUpdated": "2026-07-02T12:15:49.245Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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    "cna": {
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              "version": "master",
              "versionType": "custom"
            }
          ]
        }
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Lorenzo Cannella from Fondazione Ugo Bordoni (FUB)"
        }
      ],
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      "references": [
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}

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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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UBUNTU-CVE-2026-11946 (CVE-2026-11946)

CVE-2026-11946 (GCVE-0-2026-11946)

Tags

Sightings

Nomenclature

Related by attack behaviour