Vulnerability-Lookup

GHSA-VCHH-R53J-8MPW

Vulnerability from github – Published: 2026-07-28 20:16 – Updated: 2026-07-28 20:16

Summary

Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypasses CLI checks

Details

HTTPTriggerSpec.Validate() validated Methods, FunctionReference, Host, IngressConfig, and CorsConfig, but silently skipped RelativeURL and Prefix. Those two fields were validated at the CLI level only (pkg/fission-cli/cmd/httptrigger/create.go:83). The post-CRD-modernization webhook for HTTPTrigger was retired in favor of API-server CEL — and CEL had no rules on those fields either — so an HTTPTrigger created via kubectl apply or a direct Kubernetes REST API call bypassed every URL-level check.

A tenant with HTTPTrigger create permission could therefore create triggers whose RelativeURL or Prefix:

was empty (with both fields unset, the trigger has no URL),
did not start with /,
was exactly / (claiming the entire router root),
contained .. traversal segments (e.g. /api/../admin),
collided with router-owned routes: /router-healthz, /readyz, /_version, /auth/login,
collided with the router-internal function prefix /fission-function/<ns>/<name>.

Affected

Project: github.com/fission/fission
Versions: all versions through v1.24.0
Audited commit: 647c141
Component: pkg/apis/core/v1/validation.go:HTTPTriggerSpec.Validate (and the missing CEL on HTTPTriggerSpec)
Configuration: default

Fix section (paste into the Fix / Patches field)

Fixed in v1.25.0 by:

PR #3464 (commit 0deed6bf) — enforce the path-safety invariants at both admission layers so the API server's CEL evaluation and the Go-side HTTPTriggerSpec.Validate() agree:
Three +kubebuilder:validation:XValidation rules on HTTPTriggerSpec (the API server's CEL admission gate, regenerated into crds/v1/fission.io_httptriggers.yaml):
- at least one of relativeurl or prefix must be non-empty;
- relativeurl, when set, must start with /, must not be /, must contain no .. segment, must not be in the reserved exact-path set, and must not start with /fission-function/;
- prefix, when set, the same rules guarded by has(self.prefix).
validateTriggerPath helper in pkg/apis/core/v1/validation.go, invoked from HTTPTriggerSpec.Validate(), mirrors the CEL rules so the CLI's early rejection and the router reconciler's status-Condition path match what the API server admits.

Regression coverage: a new TestHTTPTriggerSpecValidate_Path table in pkg/apis/core/v1/validation_validators_test.go exercises every PoC case from the advisory plus literal ..-prefixed-segment positives that must remain allowed.

Severity

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.24.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fission/fission"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.25.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50569"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T20:16:00Z",
    "nvd_published_at": "2026-06-10T18:17:13Z",
    "severity": "MODERATE"
  },
  "details": "`HTTPTriggerSpec.Validate()` validated `Methods`, `FunctionReference`, `Host`, `IngressConfig`, and `CorsConfig`, but silently skipped `RelativeURL` and `Prefix`. Those two fields were validated at the CLI level only\n(`pkg/fission-cli/cmd/httptrigger/create.go:83`). The post-CRD-modernization webhook for HTTPTrigger was retired in favor of API-server CEL \u2014 and CEL had no rules on those fields either \u2014 so an HTTPTrigger created via `kubectl apply` or\na direct Kubernetes REST API call bypassed every URL-level check.\n\nA tenant with HTTPTrigger create permission could therefore create triggers whose `RelativeURL` or `Prefix`:\n\n- was empty (with both fields unset, the trigger has no URL),\n- did not start with `/`,\n- was exactly `/` (claiming the entire router root),\n- contained `..` traversal segments (e.g. `/api/../admin`),\n- collided with router-owned routes: `/router-healthz`, `/readyz`, `/_version`, `/auth/login`,\n- collided with the router-internal function prefix `/fission-function/\u003cns\u003e/\u003cname\u003e`.\n\n### Affected\n\n- Project: `github.com/fission/fission`\n- Versions: all versions through v1.24.0\n- Audited commit: `647c141`\n- Component: `pkg/apis/core/v1/validation.go:HTTPTriggerSpec.Validate` (and the missing CEL on `HTTPTriggerSpec`)\n- Configuration: default\n\nFix section (paste into the Fix / Patches field)\n\nFixed in [v1.25.0](https://github.com/fission/fission/releases/tag/v1.25.0) by:\n\n- [PR #3464](https://github.com/fission/fission/pull/3464) (commit [`0deed6bf`](https://github.com/fission/fission/commit/0deed6bf2af2a0c0c6094b25e1a0afad36773e3b)) \u2014 enforce the path-safety invariants at both admission layers so the API\nserver\u0027s CEL evaluation and the Go-side `HTTPTriggerSpec.Validate()` agree:\n  - Three `+kubebuilder:validation:XValidation` rules on `HTTPTriggerSpec` (the API server\u0027s CEL admission gate, regenerated into `crds/v1/fission.io_httptriggers.yaml`):\n    - at least one of `relativeurl` or `prefix` must be non-empty;\n    - `relativeurl`, when set, must start with `/`, must not be `/`, must contain no `..` segment, must not be in the reserved exact-path set, and must not start with `/fission-function/`;\n    - `prefix`, when set, the same rules guarded by `has(self.prefix)`.\n  - `validateTriggerPath` helper in `pkg/apis/core/v1/validation.go`, invoked from `HTTPTriggerSpec.Validate()`, mirrors the CEL rules so the CLI\u0027s early rejection and the router reconciler\u0027s status-Condition path match what the API\nserver admits.\n\nRegression coverage: a new `TestHTTPTriggerSpecValidate_Path` table in `pkg/apis/core/v1/validation_validators_test.go` exercises every PoC case from the advisory plus literal `..`-prefixed-segment positives that must remain allowed.",
  "id": "GHSA-vchh-r53j-8mpw",
  "modified": "2026-07-28T20:16:00Z",
  "published": "2026-07-28T20:16:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/security/advisories/GHSA-vchh-r53j-8mpw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50569"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/pull/3464"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/commit/0deed6bf3f26bc0f10e9130cd0d479b0b9f5f609"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fission/fission"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/releases/tag/v1.25.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypasses CLI checks"
}

CVE-2026-50569 (GCVE-0-2026-50569)

Vulnerability from cvelistv5 – Published: 2026-06-10 17:34 – Updated: 2026-06-10 18:57

Title

Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypasses CLI checks

Summary

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, HTTPTriggerSpec.Validate() validated Methods, FunctionReference, Host, IngressConfig, and CorsConfig, but silently skipped RelativeURL and Prefix. Those two fields were validated at the CLI level only (pkg/fission-cli/cmd/httptrigger/create.go:83). The post-CRD-modernization webhook for HTTPTrigger was retired in favor of API-server CEL — and CEL had no rules on those fields either — so an HTTPTrigger created via kubectl apply or a direct Kubernetes REST API call bypassed every URL-level check. This issue has been patched in version 1.25.0.

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/fission/fission/security/advis…	x_refsource_CONFIRM
https://github.com/fission/fission/pull/3464	x_refsource_MISC
https://github.com/fission/fission/releases/tag/v1.25.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fission	fission	Affected: < 1.25.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-50569",
                "options": [
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T18:51:42.432970Z",
                "version": "2.0.3"
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    "cna": {
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          "vendor": "fission",
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            }
          ]
        }
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      "descriptions": [
        {
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          "value": "Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, HTTPTriggerSpec.Validate() validated Methods, FunctionReference, Host, IngressConfig, and CorsConfig, but silently skipped RelativeURL and Prefix. Those two fields were validated at the CLI level only (pkg/fission-cli/cmd/httptrigger/create.go:83). The post-CRD-modernization webhook for HTTPTrigger was retired in favor of API-server CEL \u2014 and CEL had no rules on those fields either \u2014 so an HTTPTrigger created via kubectl apply or a direct Kubernetes REST API call bypassed every URL-level check. This issue has been patched in version 1.25.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-20",
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      "references": [
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          "name": "https://github.com/fission/fission/security/advisories/GHSA-vchh-r53j-8mpw",
          "tags": [
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          ],
          "url": "https://github.com/fission/fission/security/advisories/GHSA-vchh-r53j-8mpw"
        },
        {
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          "tags": [
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      "title": "Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypasses CLI checks"
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    "dateReserved": "2026-06-04T21:34:34.427Z",
    "dateUpdated": "2026-06-10T18:57:26.915Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-VCHH-R53J-8MPW

Affected

CVE-2026-50569 (GCVE-0-2026-50569)

Tags

Sightings

Nomenclature