CVE-2026-56742 (GCVE-0-2026-56742)

Vulnerability from cvelistv5 – Published: 2026-07-15 19:14 – Updated: 2026-07-15 19:14
VLAI
Title
Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
Summary
Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.
Severity
5.9 (Medium)
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
cilium cilium Affected: < 1.17.17
Affected: >= 1.18.0, < 1.18.11
Affected: >= 1.19.0, < 1.19.5
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "cilium",
          "vendor": "cilium",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.17.17"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.18.0, \u003c 1.18.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.19.0, \u003c 1.19.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-15T19:14:07.617Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj"
        },
        {
          "name": "https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb"
        },
        {
          "name": "https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857"
        },
        {
          "name": "https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b"
        },
        {
          "name": "https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca"
        },
        {
          "name": "https://github.com/cilium/cilium/releases/tag/v1.17.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/releases/tag/v1.17.17"
        },
        {
          "name": "https://github.com/cilium/cilium/releases/tag/v1.18.11",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/releases/tag/v1.18.11"
        },
        {
          "name": "https://github.com/cilium/cilium/releases/tag/v1.19.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cilium/cilium/releases/tag/v1.19.5"
        }
      ],
      "source": {
        "advisory": "GHSA-w7c2-w76w-5hmj",
        "discovery": "UNKNOWN"
      },
      "title": "Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-56742",
    "datePublished": "2026-07-15T19:14:07.617Z",
    "dateReserved": "2026-06-22T19:17:28.959Z",
    "dateUpdated": "2026-07-15T19:14:07.617Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-56742\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-15T20:17:51.850\",\"lastModified\":\"2026-07-15T20:54:43.733\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"cilium\",\"product\":\"cilium\",\"versions\":[{\"version\":\"\u003c 1.17.17\",\"status\":\"affected\"},{\"version\":\"\u003e= 1.18.0, \u003c 1.18.11\",\"status\":\"affected\"},{\"version\":\"\u003e= 1.19.0, \u003c 1.19.5\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":1.7,\"impactScore\":3.7}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"references\":[{\"url\":\"https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/releases/tag/v1.17.17\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/releases/tag/v1.18.11\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/releases/tag/v1.19.5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.