← Back
2026-09-26 13:24CVE-2026-100707VulnCheck
PUBLISHED5.2CWE-22

Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.

Problem type

Affected products

kyverno

kyverno

< 1.19.1 - AFFECTED

1.19.1 - UNAFFECTED

References

GitHub Security Advisory (GHSA-c5qq-7g2q-cpqp)

https://github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp

vendor-advisory
VulnCheck Advisory: Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path

https://www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-via-percent-encoded-path

third-party-advisory

GitHub Security Advisories

GHSA-66wc-m66q-pf76

Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of...

https://github.com/advisories/GHSA-66wc-m66q-pf76

Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.

github.com

https://github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp

nvd.nist.gov

https://nvd.nist.gov/vuln/detail/CVE-2026-100707

vulncheck.com

https://www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-via-percent-encoded-path

github.com

https://github.com/advisories/GHSA-66wc-m66q-pf76

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-100707
Click to expand
{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100707",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-26T13:24:01.414Z",
    "dateReserved": "2026-09-26T02:40:23.372Z",
    "datePublished": "2026-09-26T13:24:01.414Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-26T13:24:01.414Z"
      },
      "datePublic": "2026-09-10T00:00:00.000Z",
      "title": "Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path",
      "descriptions": [
        {
          "lang": "en",
          "value": "Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials."
        }
      ],
      "affected": [
        {
          "vendor": "kyverno",
          "product": "kyverno",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "1.19.1"
            },
            {
              "version": "1.19.1",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
              "cweId": "CWE-22",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp",
          "name": "GitHub Security Advisory (GHSA-c5qq-7g2q-cpqp)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-via-percent-encoded-path",
          "name": "VulnCheck Advisory: Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path",
          "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:C/C:H/I:N/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 7.7,
            "baseSeverity": "HIGH"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "dhki",
          "type": "reporter"
        }
      ]
    }
  }
}