Security advisory

{
  "id": "c98ad202b4508019ebfd970d44c5eeb3a98876c627d57dbdcfc6fb257ba2c39c",
  "url": "https://osv.dev/vulnerability/CVE-2021-3470",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3470",
    "summary": "A heap overflow issue was found in Redis in versions before 5.0.10, before 6.0.9 and before 6.2.0 when using a heap allocator other than jemalloc or glibc's malloc, leading to potential out of bound write or process crash. Effectively this flaw does not affect the vast majority of users, who use jemalloc or glibc malloc.",
    "evidence": "osv:CVE-2021-3470",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-3470",
      "aliases": [
        "CVE-2021-3470"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/redis/redis",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a767d84a7273ea05bbfbb23f4eef63af7f4a613d"
                },
                {
                  "introduced": "17dfd7cabbf7954f92b7a1243d4bb27fee5d4500"
                },
                {
                  "fixed": "25214bd7dc2f4c995d76020e95180eb4e6d51672"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:redislabs:redis:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:redislabs:redis:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.0.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.0.8",
            "6.0.7",
            "6.0.6",
            "6.0.5",
            "6.0.4",
            "6.0.3",
            "6.0.2",
            "6.0.1",
            "6.0.0",
            "5.0.9",
            "5.0.8",
            "5.0.7",
            "5.0.6",
            "5.0.5",
            "5.0.4",
            "5.0.3",
            "5.0.2",
            "5.0.1",
            "5.0.0",
            "5.0-rc6",
            "5.0-rc5",
            "5.0-rc4",
            "5.0-rc3",
            "5.0-rc2",
            "5.0-rc1",
            "2.3-alpha0",
            "2.2.0-rc1",
            "2.2-alpha6",
            "2.2-alpha5",
            "2.2-alpha4",
            "2.2-alpha3",
            "2.2-alpha2",
            "2.2-alpha1",
            "2.2-alpha0",
            "v2.0.0-rc1",
            "v2.1.1-watch",
            "v1.3.11",
            "v1.3.10",
            "v1.3.9",
            "v1.3.8",
            "v1.3.7",
            "1.3.6",
            "vm-playpen"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3470.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-3470-d9c2de3c",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "98964882074945733751311516603340189559",
                    "230803765453809963299864293919790295028",
                    "243859763342964630570980923915991170684",
                    "68884579141477548648148203384162253273",
                    "162747755613878333719690609041726761845",
                    "21768604112216208072036754617435148028",
                    "258380497625176050313430929159928959665",
                    "33030136671067620788959534346992734631"
                  ]
                },
                "source": "https://github.com/redis/redis/commit/25214bd7dc2f4c995d76020e95180eb4e6d51672",
                "target": {
                  "file": "src/help.h"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-24T14:18:04Z"
          }
        }
      ],
      "modified": "2026-10-24T14:18:04.754028452Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=1943623"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:redislabs:redis:6.2.0:rc1:*:*:*:*:*:*",
              "cpe:2.3:a:redislabs:redis:6.2.0:rc2:*:*:*:*:*:*",
              "cpe:2.3:a:redislabs:redis:6.2.0:rc3:*:*:*:*:*:*"
            ],
            "vendor_product": "redislabs:redis",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "6.2.0-rc1"
                  },
                  {
                    "last_affected": "6.2.0-rc1"
                  },
                  {
                    "introduced": "6.2.0-rc2"
                  },
                  {
                    "last_affected": "6.2.0-rc2"
                  },
                  {
                    "introduced": "6.2.0-rc3"
                  },
                  {
                    "last_affected": "6.2.0-rc3"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-3470",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 443442,
  "published_at": "2021-03-31T14:15:20.937+00:00"
}