Vulnerability-Lookup

ubuntu-cve-2026-33376

Vulnerability from osv_ubuntu

Published

2026-05-13 20:16

Modified

2026-05-13 20:16

Summary

Details

When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here.

Severity

7.4 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-33376	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-33376	REPORT
	https://grafana.com/security/security-advisories/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "grafana",
            "binary_version": "2.6.0+dfsg-1"
          },
          {
            "binary_name": "grafana-data",
            "binary_version": "2.6.0+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "grafana",
        "purl": "pkg:deb/ubuntu/grafana@2.6.0+dfsg-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.0+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here.",
  "id": "UBUNTU-CVE-2026-33376",
  "modified": "2026-05-13T20:16:00Z",
  "published": "2026-05-13T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33376"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33376"
    },
    {
      "type": "REPORT",
      "url": "https://grafana.com/security/security-advisories/cve-2026-33376"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-33376"
  ]
}

CVE-2026-33376 (GCVE-0-2026-33376)

Vulnerability from cvelistv5 – Published: 2026-05-13 19:28 – Updated: 2026-07-13 13:27

Title

Auth Proxy IPv6 whitelist bypass

Summary

Severity

7.4 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-1188 - Initialization of a Resource with an Insecure Default

Assigner

GRAFANA

References

1 reference

URL	Tags
https://grafana.com/security/security-advisories/…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Grafana	Grafana OSS	Affected: 9.4.0 , ≤ 11.6.14 (semver) Affected: 11.6.14 , < 11.6.14+security-04 (custom) Affected: 12.0.0 , ≤ 12.2.8 (semver) Affected: 12.2.8 , < 12.2.8+security-04 (custom) Affected: 12.3.0 , ≤ 12.3.6 (semver) Affected: 12.3.6 , < 12.3.6+security-04 (custom) Affected: 12.4.0 , ≤ 12.4.3 (semver) Affected: 12.4.3 , < 12.4.3+security-02 (custom) Affected: 13.0.0 , ≤ 13.0.1 (semver) Affected: 13.0.1 , < 13.0.1+security-01 (custom)

Date Public

2026-05-13 07:44

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33376",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-15T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-1188",
                "description": "CWE-1188 Initialization of a Resource with an Insecure Default",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-16T03:56:01.168Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Grafana OSS",
          "vendor": "Grafana",
          "versions": [
            {
              "lessThanOrEqual": "11.6.14",
              "status": "affected",
              "version": "9.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "11.6.14+security-04",
              "status": "affected",
              "version": "11.6.14",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "12.2.8",
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "12.2.8+security-04",
              "status": "affected",
              "version": "12.2.8",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "12.3.6",
              "status": "affected",
              "version": "12.3.0",
              "versionType": "semver"
            },
            {
              "lessThan": "12.3.6+security-04",
              "status": "affected",
              "version": "12.3.6",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "12.4.3",
              "status": "affected",
              "version": "12.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "12.4.3+security-02",
              "status": "affected",
              "version": "12.4.3",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "13.0.1",
              "status": "affected",
              "version": "13.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "13.0.1+security-01",
              "status": "affected",
              "version": "13.0.1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2026-05-13T07:44:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-13T13:27:18.460Z",
        "orgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
        "shortName": "GRAFANA"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://grafana.com/security/security-advisories/cve-2026-33376"
        }
      ],
      "source": {
        "discovery": "BUG_BOUNTY"
      },
      "title": "Auth Proxy IPv6 whitelist bypass",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
    "assignerShortName": "GRAFANA",
    "cveId": "CVE-2026-33376",
    "datePublished": "2026-05-13T19:28:34.473Z",
    "dateReserved": "2026-03-19T07:55:06.977Z",
    "dateUpdated": "2026-07-13T13:27:18.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

Detection rules are retrieved from Rulezet.

Action not permitted

ubuntu-cve-2026-33376

Vulnerability from osv_ubuntu

CVE-2026-33376 (GCVE-0-2026-33376)

Tags

Sightings

Nomenclature