CVE catalog

CVE-2026-11946

DEBIAN-

[CVE catalog]

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
Unknown · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.52% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "open62541",
      "distro": "debian",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "13",
      "versions": [
        "1.4.11.1-1",
        "1.4.18-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "DEBIAN-CVE-2026-11946"
    },
    {
      "name": "open62541",
      "distro": "debian",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "14",
      "versions": [
        "1.4.11.1-1",
        "1.4.18-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "DEBIAN-CVE-2026-11946"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 13 (Trixie)]

  • [libopen62541-1.4]Unknown

    Source package: [open62541]

    Details (2)

    • 1.4.11.1-1 · amd64 · trixie

      Affected

      pypi · open62541 · debian · 13

    • 1.4.11.1-1 · arm64 · trixie

      Affected

      pypi · open62541 · debian · 13

  • [libopen62541-1.4-dev]Unknown

    Source package: [open62541]

    Details (2)

    • 1.4.11.1-1 · amd64 · trixie

      Affected

      pypi · open62541 · debian · 13

    • 1.4.11.1-1 · arm64 · trixie

      Affected

      pypi · open62541 · debian · 13

  • [libopen62541-1.4-tools]Unknown

    Source package: [open62541]

    Details (2)

    • 1.4.11.1-1 · all · trixie

      Affected

      pypi · open62541 · debian · 13

    • 1.4.11.1-1 · all · trixie

      Affected

      pypi · open62541 · debian · 13

Observed:

References

[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]