CVE-2026-115482

Full vulnerability record from the local CVENow database.

Description

In lsquic before 4.9.0, the HTTP/3 implementation can use an excessive amount of memory because the number of buffered header sets is not limited, as demonstrated by a QPACK amplification attack. This is related to header_out_dynamic_entry and es_max_header_list_size.

Severity

HIGH

CVSS score

7.5 (v3.1)

Vulnerability status

Deferred

Source identifier

[email protected]

Published

2026-10-22 16:17:35.490000

Last modified

2026-10-22 19:17:48.100000

View original CVE JSON

{
  "id": "CVE-2026-115482",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-22T16:17:35.490",
  "lastModified": "2026-10-22T19:17:48.100",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In lsquic before 4.9.0, the HTTP/3 implementation can use an excessive amount of memory because the number of buffered header sets is not limited, as demonstrated by a QPACK amplification attack. This is related to header_out_dynamic_entry and es_max_header_list_size."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "litespeedtech",
          "product": "lsquic",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "lessThan": "4.9.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-22T18:34:24.530507Z",
          "id": "CVE-2026-115482",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://foxio.io/blog/header-accordions-qpack-amplification-attacks-against-http-3-servers",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/litespeedtech/lsquic/compare/v4.8.2...v4.9.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/litespeedtech/lsquic/pull/666",
      "source": "[email protected]"
    }
  ]
}