CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression

{
  "id": "2960ab0d47c2944e83d85dbb27e43741ca22130d0aabc6e6cff7873014d15547",
  "url": "https://osv.dev/vulnerability/CVE-2026-44981",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression",
    "summary": "CrowdSec offers crowdsourced protection against malicious IPs. From 1.7.0 until 1.7.8, the LAPI router used gin-contrib/gzip with DefaultDecompressHandle globally in pkg/apiserver/controllers/controller.go, causing /v1/watchers and /v1/watchers/login to decompress unauthenticated gzip-compressed JSON request bodies without enforcing a maximum decompressed size and allowing excessive heap allocation that can make LAPI unreachable. This issue is fixed in version 1.7.8.",
    "evidence": "osv:CVE-2026-44981",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44981",
      "aliases": [
        "CVE-2026-44981",
        "GHSA-273h-gvwr-c3qj",
        "GO-2026-5041"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/crowdsecurity/crowdsec",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c3036e21abca984952947360e47f1f36c2ef1b22"
                },
                {
                  "fixed": "632274597a88a6b01ed41c0e6affca0f87ff26df"
                },
                {
                  "fixed": "54a0dfe6c16b7687b0da6634e0b19ef0f5d9bb30"
                },
                {
                  "fixed": "56d0d6915f7f25941dc5b4f484028646f6601a37"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.7.0"
                      },
                      {
                        "fixed": "1.7.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "54a0dfe6c16b7687b0da6634e0b19ef0f5d9bb30"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "56d0d6915f7f25941dc5b4f484028646f6601a37"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.7.8-rc1",
            "v1.7.7-rc1",
            "v1.7.7",
            "v1.7.6",
            "v1.7.5",
            "v1.7.5-rc1",
            "v1.7.4",
            "v1.7.4-rc2",
            "v1.7.4-rc1",
            "v1.7.1",
            "v1.7.1-rc4",
            "v1.7.1-rc3",
            "v1.7.1-rc2",
            "v1.7.1-rc1",
            "v1.7.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44981.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.600145895Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44981.json",
        "https://github.com/crowdsecurity/crowdsec/security/advisories/GHSA-273h-gvwr-c3qj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44981",
        "https://github.com/crowdsecurity/crowdsec/commit/54a0dfe6c16b7687b0da6634e0b19ef0f5d9bb30",
        "https://github.com/crowdsecurity/crowdsec/commit/56d0d6915f7f25941dc5b4f484028646f6601a37"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-409"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44981.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44981",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493436,
  "published_at": "2026-07-16T19:47:30.747+00:00"
}