{
  "cveId": "CVE-2026-66338",
  "url": "https://patchblox.com/security/cve/CVE-2026-66338",
  "summary": "CVE-2026-66338 is fixed in 10 products on 1 platform, first by ALAS2023-2026-3212, released November 7, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libsoup: A flaw was found in libsoup",
  "description": "A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.",
  "published": "2026-10-12T09:00:00Z",
  "severity": "important",
  "epss": 0.00291,
  "epssPercentile": 0.21928,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "amzn 2023",
      "fixedVersion": "2.72.0-6.amzn2023.0.16",
      "fix": "ALAS2023-2026-3212",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3212",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.72.0-6.amzn2023.0.16",
      "fix": "ALAS2023-2026-3212",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3212",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "2.72.0-6.amzn2023.0.16",
      "fix": "ALAS2023-2026-3212",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3212",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-devel",
      "release": "amzn 2023",
      "fixedVersion": "2.72.0-6.amzn2023.0.16",
      "fix": "ALAS2023-2026-3212",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3212",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-doc",
      "release": "amzn 2023",
      "fixedVersion": "2.72.0-6.amzn2023.0.16",
      "fix": "ALAS2023-2026-3212",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3212",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3",
      "release": "amzn 2023",
      "fixedVersion": "3.7.3-1.amzn2023",
      "fix": "ALAS2023-2026-3240",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3240",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.7.3-1.amzn2023",
      "fix": "ALAS2023-2026-3240",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3240",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "3.7.3-1.amzn2023",
      "fix": "ALAS2023-2026-3240",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3240",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-devel",
      "release": "amzn 2023",
      "fixedVersion": "3.7.3-1.amzn2023",
      "fix": "ALAS2023-2026-3240",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3240",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-doc",
      "release": "amzn 2023",
      "fixedVersion": "3.7.3-1.amzn2023",
      "fix": "ALAS2023-2026-3240",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3240",
      "released": "2026-11-07T01:06:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}