Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100836",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-27T01:29:58.070Z",
    "dateReserved": "2026-09-26T23:23:03.410Z",
    "datePublished": "2026-09-27T01:29:58.070Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-27T01:29:58.070Z"
      },
      "datePublic": "2026-05-27T00:00:00.000Z",
      "title": "Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer",
      "descriptions": [
        {
          "lang": "en",
          "value": "Contrast through 1.20.0 contains a panic vulnerability in the transit-engine endpoint's ciphertextContainer.UnmarshalJSON function that fails to validate decoded ciphertext length before slicing. An authenticated workload with a valid mesh certificate can trigger a runtime panic by submitting a short base64-encoded ciphertext, causing log spam and request failures without crashing the process."
        }
      ],
      "affected": [
        {
          "vendor": "edgelesssys",
          "product": "contrast",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "1.20.0"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Improper Validation of Array Index",
              "cweId": "CWE-129",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp",
          "name": "GitHub Security Advisory (GHSA-3ccm-4qq2-5wrp)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-denial-of-service-via-ciphertextcontainer",
          "name": "VulnCheck Advisory: Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM"
          }
        }
      ]
    }
  }
}