Security advisory

{
  "id": "dc3b93cfa83419710251198f22d800a292920ac035cf5bdd419b4a8db4542fec",
  "url": "https://osv.dev/vulnerability/CVE-2021-40516",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-40516",
    "summary": "WeeChat before 3.2.1 allows remote attackers to cause a denial of service (crash) via a crafted WebSocket frame that trigger an out-of-bounds read in plugins/relay/relay-websocket.c in the Relay plugin.",
    "evidence": "osv:CVE-2021-40516",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-40516",
      "aliases": [
        "CVE-2021-40516"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/weechat/weechat",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ba5664a019508347af517ace0f04ee32d4055216"
                },
                {
                  "fixed": "3e180a3c9082cf214efa72935184861b8f8a8540"
                },
                {
                  "fixed": "8b1331f98de1714bae15a9ca2e2b393ba49d735b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:weechat:weechat:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.4.1"
                      },
                      {
                        "fixed": "3.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8b1331f98de1714bae15a9ca2e2b393ba49d735b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.3",
            "v3.2",
            "v3.2-rc1",
            "v3.1",
            "v3.1-rc1",
            "v3.0",
            "v3.0-rc1",
            "v2.9",
            "v2.9-rc1",
            "v2.8",
            "v2.8-rc1",
            "v2.7",
            "v2.7-rc1",
            "v2.6",
            "v2.6-rc2",
            "v2.6-rc1",
            "v2.5",
            "v2.5-rc2",
            "v2.5-rc1",
            "v2.4",
            "v2.4-rc1",
            "v2.3-rc1",
            "v2.2",
            "v2.2-rc2",
            "v2.2-rc1",
            "v2.1",
            "v2.1-rc1",
            "v2.0",
            "v2.0-rc1",
            "v1.9",
            "v1.9-rc2",
            "v1.9-rc1",
            "v1.8",
            "v1.8-rc1",
            "v1.7",
            "v1.7-rc2",
            "v1.7-rc1",
            "v1.6",
            "v1.6-rc2",
            "v1.6-rc1",
            "v1.5",
            "v1.5-rc2",
            "v1.5-rc1",
            "v1.4",
            "v1.4-rc2",
            "v1.4-rc1",
            "v1.3",
            "v1.3-rc2",
            "v1.3-rc1",
            "v1.2",
            "v1.2-rc2",
            "v1.2-rc1",
            "v1.1",
            "v1.1-rc2",
            "v1.1-rc1",
            "v1.0",
            "v1.0-rc3",
            "v1.0-rc2",
            "v1.0-rc1",
            "v0.4.3",
            "v0.4.3-rc2",
            "v0.4.3-rc1",
            "v0.4.2",
            "v0.4.2-rc2",
            "v0.4.2-rc1",
            "v0.4.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40516.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-40516-353cee5b",
                "digest": {
                  "length": 1292,
                  "function_hash": "90984801403705773734291904413682159646"
                },
                "source": "https://github.com/weechat/weechat/commit/8b1331f98de1714bae15a9ca2e2b393ba49d735b",
                "target": {
                  "file": "src/plugins/relay/relay-websocket.c",
                  "function": "relay_websocket_decode_frame"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-40516-f0fe135d",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "185022148163257089434961016404046252569",
                    "184744754322552087026858270309936591790",
                    "191183726525295947973913069477825404381",
                    "68668294676952027065538799851858869832",
                    "60044029408785289657743013144701600498",
                    "53318637778942654248644030389717365042",
                    "53534688126527754786968734116397354900",
                    "140022038909199881189320215257515401726",
                    "268943608237821586650034687314187702877",
                    "285334332598187027351225037205398649593",
                    "255007784547851831597708940877279823122",
                    "173371007676917502685001025229199806348",
                    "226270972019004488545873450194490022194",
                    "324481065871207876708782365308912011591",
                    "11404280253700365656450875383320078459",
                    "114194268252433711824331716049407082525",
                    "137109977297919328510141836220320587523",
                    "242376844075321787239986594644343304784",
                    "316063017631408290107575463454114821044",
                    "142928069766618059012610996476402069099"
                  ]
                },
                "source": "https://github.com/weechat/weechat/commit/8b1331f98de1714bae15a9ca2e2b393ba49d735b",
                "target": {
                  "file": "src/plugins/relay/relay-websocket.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:29:52Z"
          }
        }
      ],
      "modified": "2026-10-20T14:29:52.110222542Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html",
        "https://github.com/weechat/weechat/commit/8b1331f98de1714bae15a9ca2e2b393ba49d735b",
        "https://weechat.org/doc/security/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-40516",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 389080,
  "published_at": "2021-09-05T18:15:07.26+00:00"
}