CVE-2026-63383 affecting package libtevent 0.14.1-1

{
  "id": "b02946ecbaa6a181ea36084a9851e4ffb3dbf2b3fca4d4a85d68453efc397bed",
  "url": "https://osv.dev/vulnerability/AZL-96921",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-63383 affecting package libtevent 0.14.1-1",
    "summary": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
    "evidence": "osv:AZL-96921",
    "products": [
      {
        "name": {
          "value": "libtevent",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-96921",
      "aliases": [
        "AZL-96921"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "0.14.1-1"
                }
              ]
            }
          ],
          "package": {
            "name": "libtevent",
            "purl": "pkg:rpm/azure-linux/libtevent",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96921.json"
          }
        }
      ],
      "modified": "2026-10-22T05:37:13Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-63383"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63383"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-63383",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 404540,
  "published_at": "2026-08-20T18:16:35+00:00"
}