{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-6550",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-6550",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-20T19:20:23.383Z",
    "updatedAt": "2026-04-20T19:44:11.685Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python",
      "summary": "Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version  4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts.\n\nTo remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.",
      "affected": [
        {
          "vendor": "AWS",
          "product": "AWS Encryption SDK for Python",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "2.5.1"
            },
            {
              "version": "3",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "3.3.0"
            },
            {
              "version": "4",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.0.4"
            }
          ]
        }
      ]
    }
  }
}