Higress before 2.2.4 Rate Limit Bypass via Malformed Cookie Header

{
  "id": "0bc00e3808ae65f5231fe09b99fea0f1a614226f7a06afa585b2bd4011c80638",
  "url": "https://osv.dev/vulnerability/CVE-2026-92790",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Higress before 2.2.4 Rate Limit Bypass via Malformed Cookie Header",
    "summary": "Higress before 2.2.4 panics when processing a Cookie header segment without an equals sign, causing the plugin wrapper to recover and return a continue action that bypasses AI token rate limiting. Unauthenticated attackers can craft a malformed Cookie header to skip rate limit checks and exceed thresholds intended to restrict costly model backend calls.",
    "evidence": "osv:CVE-2026-92790",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-92790",
      "aliases": [
        "CVE-2026-92790"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/higress-group/higress",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "58666ac985cee19a0a9a353421c63cead6d0cb47"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.2.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.2.4"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.2.3",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.9",
            "v2.1.9-rc.1",
            "v2.1.8",
            "v2.1.7",
            "v2.1.6",
            "v2.1.5",
            "v2.1.5-rc.1",
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.2-rc.1",
            "wasm-go-ai-proxy-v1.0.0",
            "v2.1.1",
            "v2.1.1-rc.1",
            "v2.1.0",
            "v2.1.0-rc.2",
            "v2.1.0-rc.1",
            "v2.0.7",
            "plugins/wasm-go/v1.4.3",
            "v2.0.6",
            "v2.0.6-rc.3",
            "v2.0.5",
            "v2.0.6-rc.2",
            "v2.0.6-rc.1",
            "v2.0.4",
            "wasm-go-ai-security-guard-v1.0.0",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v2.0.0-rc.1",
            "latest",
            "wasm-go-ext-auth-v1.0.0",
            "v1.4.2",
            "plugins/wasm-go/v1.4.2",
            "wasm-go-cluster-key-rate-limit-v1.0.0",
            "wasm-go-custom-response-v1.0.0",
            "v1.4.1",
            "plugins/wasm-go/v1.4.0",
            "v1.4.0",
            "v1.4.0-rc.1",
            "v1.3.6",
            "v1.3.5",
            "plugins/wasm-go/v1.3.5",
            "v1.3.4",
            "v1.3.4-rc.2",
            "v1.3.4-rc.1",
            "v1.3.3",
            "v1.3.2",
            "plugins/wasm-go/v1.3.2",
            "v1.3.1",
            "plugins/wasm-go/v1.3.1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v1.0.0-rc.4",
            "v0.7.4",
            "v0.7.3",
            "v1.0.0-rc.3",
            "v1.0.0-rc.2",
            "v1.0.0-rc",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92790.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.578724017Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92790.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92790",
        "https://www.vulncheck.com/advisories/higress-before-2.2.4-rate-limit-bypass-via-malformed-cookie-header",
        "https://github.com/higress-group/higress/issues/4599",
        "https://github.com/higress-group/higress/blob/v2.2.4/plugins/wasm-go/extensions/ai-token-ratelimit/util/utils.go#L52-L63",
        "https://github.com/higress-group/higress",
        "https://github.com/higress-group/higress/blob/v2.2.3/plugins/wasm-go/extensions/ai-token-ratelimit/util/utils.go#L52-L63"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-703"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92790.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92790",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495300,
  "published_at": "2026-09-16T20:32:46.062+00:00"
}