Vulnerability-Lookup

GHSA-J8GC-GXPV-W8RG

Vulnerability from github – Published: 2026-10-27 18:31 – Updated: 2026-10-27 18:31

Details

Knative pkg provides common packages shared across Knative repositories. Prior to 0.0.0-20260531000007-52dbd5ece63f, the knative.dev/pkg/webhook admissionHandler in webhook/admission.go decodes an attacker-supplied AdmissionReview through json.NewDecoder(io.TeeReader(r.Body, &bodyBuffer)) under an http.HandlerFunc without an http.MaxBytesReader or equivalent body-size limit. A pod-network client can send one oversized POST to an admission webhook, causing the decoder and bodyBuffer to retain amplified copies of the request until the controller pod exhausts memory and is OOM-killed. Every downstream consumer using the shared webhook server inherits the vulnerable behavior, including Knative, Tekton, KEDA, Sigstore policy-controller, and Kpack. For consumers configured with failurePolicy=Fail, loss of the controller can interrupt admission; with failurePolicy=Ignore, the affected webhook is unavailable while other admissions continue. This issue is fixed in version 0.0.0-20260531000007-52dbd5ece63f.

Severity

6.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-54462"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-27T17:17:01Z",
    "severity": "MODERATE"
  },
  "details": "Knative pkg provides common packages shared across Knative repositories. Prior to 0.0.0-20260531000007-52dbd5ece63f, the knative.dev/pkg/webhook admissionHandler in webhook/admission.go decodes an attacker-supplied AdmissionReview through json.NewDecoder(io.TeeReader(r.Body, \u0026bodyBuffer)) under an http.HandlerFunc without an http.MaxBytesReader or equivalent body-size limit. A pod-network client can send one oversized POST to an admission webhook, causing the decoder and bodyBuffer to retain amplified copies of the request until the controller pod exhausts memory and is OOM-killed. Every downstream consumer using the shared webhook server inherits the vulnerable behavior, including Knative, Tekton, KEDA, Sigstore policy-controller, and Kpack. For consumers configured with failurePolicy=Fail, loss of the controller can interrupt admission; with failurePolicy=Ignore, the affected webhook is unavailable while other admissions continue. This issue is fixed in version 0.0.0-20260531000007-52dbd5ece63f.",
  "id": "GHSA-j8gc-gxpv-w8rg",
  "modified": "2026-10-27T18:31:46Z",
  "published": "2026-10-27T18:31:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54462"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knative/pkg/pull/3363"
    },
    {
      "type": "WEB",
      "url": "https://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-54462 (GCVE-0-2026-54462)

Vulnerability from cvelistv5 – Published: 2026-10-27 16:12 – Updated: 2026-10-27 16:12

Title

knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion

Summary

Severity

6.5 (Medium)


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

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7994 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/knative/pkg/security/advisorie…	x_refsource_CONFIRM
https://github.com/knative/pkg/pull/3363	x_refsource_MISC
https://github.com/knative/pkg/commit/52dbd5ece63…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
knative	pkg	Affected: < 0.0.0-20260531000007-52dbd5ece63f

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "pkg",
          "vendor": "knative",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.0-20260531000007-52dbd5ece63f"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Knative pkg provides common packages shared across Knative repositories. Prior to 0.0.0-20260531000007-52dbd5ece63f, the knative.dev/pkg/webhook admissionHandler in webhook/admission.go decodes an attacker-supplied AdmissionReview through json.NewDecoder(io.TeeReader(r.Body, \u0026bodyBuffer)) under an http.HandlerFunc without an http.MaxBytesReader or equivalent body-size limit. A pod-network client can send one oversized POST to an admission webhook, causing the decoder and bodyBuffer to retain amplified copies of the request until the controller pod exhausts memory and is OOM-killed. Every downstream consumer using the shared webhook server inherits the vulnerable behavior, including Knative, Tekton, KEDA, Sigstore policy-controller, and Kpack. For consumers configured with failurePolicy=Fail, loss of the controller can interrupt admission; with failurePolicy=Ignore, the affected webhook is unavailable while other admissions continue. This issue is fixed in version 0.0.0-20260531000007-52dbd5ece63f."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T16:12:32.516Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj"
        },
        {
          "name": "https://github.com/knative/pkg/pull/3363",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/knative/pkg/pull/3363"
        },
        {
          "name": "https://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818"
        }
      ],
      "source": {
        "advisory": "GHSA-2hw4-c9m4-f2fj",
        "discovery": "UNKNOWN"
      },
      "title": "knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54462",
    "datePublished": "2026-10-27T16:12:32.516Z",
    "dateReserved": "2026-06-15T15:30:40.318Z",
    "dateUpdated": "2026-10-27T16:12:32.516Z",
    "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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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