CVE-2026-42772 affecting package cloud-hypervisor 52.0.152-1

{
  "id": "65b0447dd039fb2b3cc001e5b02d301e1203925527ae028663e7878ba56c1869",
  "url": "https://osv.dev/vulnerability/AZL-105456",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-42772 affecting package cloud-hypervisor 52.0.152-1",
    "summary": "Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC peer that completes the handshake can create a connection-scoped CPU pressure and potentially a Denial of Service using compliant STREAM frames inside the advertised receive window, with low attacker bandwidth. CWE: CWE-407: Inefficient Algorithmic Complexity Description: OpenSSL manages received QUIC stream fragments using a doubly-linked list. While it optimizes for append operations (at the end of the list), it falls back to a head-to-tail linear search for any fragment that does not immediately follow the current `tail`. By manipulating the sequence of offsets, an attacker can force the server to perform O(n^2) operations, consuming excessive CPU time for the QUIC process. FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.",
    "evidence": "osv:AZL-105456",
    "products": [
      {
        "name": {
          "value": "cloud-hypervisor",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-105456",
      "aliases": [
        "AZL-105456"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "52.0.152-1"
                }
              ]
            }
          ],
          "package": {
            "name": "cloud-hypervisor",
            "purl": "pkg:rpm/azure-linux/cloud-hypervisor",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-105456.json"
          }
        }
      ],
      "modified": "2026-10-15T05:37:09Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-42772"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42772"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-42772",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 321311,
  "published_at": "2026-09-29T16:17:07+00:00"
}