libsoup3 — security advisory

{
  "id": "97a0cc2f9e7dbaac76c4336ecfad377c09b276c2031422b4deb67fff68edfc07",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-12478",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-12478",
    "summary": "The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.",
    "evidence": "osv:DEBIAN-CVE-2026-12478",
    "products": [
      {
        "name": {
          "value": "libsoup3",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.8.0-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.6.5-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-7",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-8",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5-9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.6-1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-12478",
      "aliases": [
        "DEBIAN-CVE-2026-12478"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.8.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "libsoup3",
            "purl": "pkg:deb/debian/libsoup3?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "3.6.5-3",
            "3.6.5-4",
            "3.6.5-5",
            "3.6.5-6",
            "3.6.5-7",
            "3.6.5-8",
            "3.6.5-9",
            "3.6.6-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12478.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-25T09:47:36.839499511Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-12478"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-12478"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-12478",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 445311,
  "published_at": "2026-07-14T10:16:30.957+00:00"
}