Envoy HTTP: OAuth2 filter late async token completion after stream teardown (UAF / crash risk)

{
  "id": "1e175030df0114e16c3ebccc568af4cfd8cbc2cc9e7bb33349fee33f60be3b67",
  "url": "https://osv.dev/vulnerability/CVE-2026-48090",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Envoy HTTP: OAuth2 filter late async token completion after stream teardown (UAF / crash risk)",
    "summary": "Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, the HTTP OAuth2 filter (envoy.filters.http.oauth2) can leave an in-flight async token exchange attached to a downstream stream that has already been torn down. A late AsyncClient completion can still invoke OAuth2Filter methods that use StreamDecoderFilterCallbacks after that object’s lifetime has ended, causing undefined behavior, worker crashes (availability loss), and use-after-free / invalid-vptr failures under AddressSanitizer. This is a memory-safety / lifetime issue in the data plane, not a trivial config bug. Remote code execution is not claimed here; the primary demonstrated impact is DoS via crash and UB; any further impact would be deployment- and allocator-dependent. This vulnerability is fixed in 1.37.5 and 1.38.3.",
    "evidence": "osv:CVE-2026-48090",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-48090",
      "aliases": [
        "BIT-envoy-2026-48090",
        "CVE-2026-48090",
        "GHSA-3cj2-c63f-q26f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/envoyproxy/envoy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3"
                },
                {
                  "fixed": "f97695a50e11f5ff6719e129a466bf9204b64a7f"
                },
                {
                  "introduced": "f1dd21b16c244bda00edfb5ffce577e12d0d2ec2"
                },
                {
                  "fixed": "0ebfcfe5b0484b89ca85b761da9e05ce75dbda8d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.37.0"
                      },
                      {
                        "fixed": "1.37.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.38.0"
                      },
                      {
                        "fixed": "1.38.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.38.2",
            "v1.37.4",
            "v1.38.1",
            "v1.37.3",
            "v1.38.0",
            "v1.37.2",
            "v1.37.1",
            "v1.37.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48090.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.840659396Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48090.json",
        "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3cj2-c63f-q26f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48090"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48090.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48090",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494481,
  "published_at": "2026-06-26T18:03:05.257+00:00"
}