{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "CVE-2026-21720: fix denial of service by preventing goroutine leaks and\n  memory exhaustion triggered by unauthenticated avatar cache requests",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1775825437",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1775825437"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/advisories/2026/clsa-2026_1775825437.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-04-10T12:51:10Z",
      "generator": {
        "date": "2026-04-10T12:51:10Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1775825437",
      "initial_release_date": "2026-04-10T12:51:10Z",
      "revision_history": [
        {
          "date": "2026-04-10T12:51:10Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "grafana: Fix of CVE-2026-21720"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "AlmaLinux 9.2",
                "product": {
                  "name": "AlmaLinux 9.2",
                  "product_id": "AlmaLinux-9.2",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:almalinux:almalinux:9.2:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "AlmaLinux"
          }
        ],
        "category": "vendor",
        "name": "AlmaLinux OS Foundation"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64",
                "product": {
                  "name": "grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64",
                  "product_id": "grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/grafana@9.0.9-4.el9_2.alma.1.tuxcare.els14?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64 as a component of AlmaLinux 9.2",
          "product_id": "AlmaLinux-9.2:grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64"
        },
        "product_reference": "grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64",
        "relates_to_product_reference": "AlmaLinux-9.2"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-21720",
      "cwe": {
        "id": "CWE-772",
        "name": "Missing Release of Resource after Effective Lifetime"
      },
      "notes": [
        {
          "category": "description",
          "text": "Every uncached /avatar/:hash request spawns a goroutine that refreshes the Gravatar image. If the refresh sits in the 10-slot worker queue longer than three seconds, the handler times out and stops listening for the result, so that goroutine blocks forever trying to send on an unbuffered channel. Sustained traffic with random hashes keeps tripping this timeout, so goroutine count grows linearly, eventually exhausting memory and causing Grafana to crash on some systems.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AlmaLinux-9.2:grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-21720"
        }
      ],
      "release_date": "2026-01-27T09:07:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-04-10T12:50:40.742578Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1775825437",
          "product_ids": [
            "AlmaLinux-9.2:grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1775825437"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AlmaLinux-9.2:grafana-0:9.0.9-4.el9_2.alma.1.tuxcare.els14.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}