{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "3.7.3"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "402d0fa189abfdd2071bab9fa3fc926f4ed7f70d"
            }
          ],
          "repo": "https://github.com/gnome/libsoup",
          "type": "GIT"
        }
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "3.7.3"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "402d0fa189abfdd2071bab9fa3fc926f4ed7f70d"
            }
          ],
          "repo": "https://gitlab.gnome.org/gnome/libsoup",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "redhat",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102559.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "range": [
              {
                "fixed": "0:3.6.5-3.el10_2.20"
              },
              {
                "fixed": "0:2.62.3-19.el8_10"
              },
              {
                "fixed": "0:2.62.3-19.el8_10"
              },
              {
                "fixed": "0:2.72.0-16.el9_8.8"
              }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "InverseAffectedRanges"
          }
        ]
      }
    ]
  },
  "details": "A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.",
  "id": "CVE-2026-102559",
  "modified": "2026-10-28T02:31:10.894773664Z",
  "published": "2026-09-29T17:15:34.470Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://access.redhat.com/downloads/content/package-browser/"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:83384"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:83618"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:84586"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-102559"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102559.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102559"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543285"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Libsoup: libsoup: heap buffer overflow during websocket client-frame masking"
}