Vulnerability-Lookup

CVE-2026-91080 (GCVE-0-2026-91080)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:52 – Updated: 2026-09-14 19:09

Title

webhook through 2.8.3 Memory Exhaustion via Oversized Request Body

Summary

webhook through 2.8.3 reads the entire request body into memory before evaluating trigger rules, allowing unauthenticated attackers to exhaust memory by sending oversized bodies. Attackers can send multi-gigabyte request bodies with invalid signatures to trigger out-of-memory conditions and crash the service.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 19:09 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/adnanh/webhook/issues/756	issue-tracking
https://github.com/adnanh/webhook	product
https://github.com/adnanh/webhook/blob/2.8.3/webhook.go	technical-description
https://www.vulncheck.com/advisories/webhook-thro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
adnanh	webhook	Affected: 0 , ≤ 2.8.3 (custom)	guessed

Date Public

2026-06-13 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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  "containers": {
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                "id": "CVE-2026-91080",
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                    "Automatable": "yes"
                  },
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                  }
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}

FKIE_CVE-2026-91080

Vulnerability from fkie_nvd - Published: 2026-09-14 18:20 - Updated: 2026-09-14 19:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/adnanh/webhook
	disclosure@vulncheck.com	https://github.com/adnanh/webhook/blob/2.8.3/webhook.go
	disclosure@vulncheck.com	https://github.com/adnanh/webhook/issues/756
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/webhook-through-2.8.3-memory-exhaustion-via-oversized-request-body
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/adnanh/webhook/issues/756

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/adnanh/webhook",
          "product": "webhook",
          "repo": "https://github.com/adnanh/webhook",
          "vendor": "adnanh",
          "versions": [
            {
              "lessThanOrEqual": "2.8.3",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
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  ],
  "cveTags": [],
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    }
  ],
  "id": "CVE-2026-91080",
  "lastModified": "2026-09-14T19:18:14.500",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
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        "type": "Secondary"
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    ],
    "cvssMetricV40": [
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        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
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          "modifiedPrivilegesRequired": "NOT_DEFINED",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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      "url": "https://github.com/adnanh/webhook"
    },
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      "url": "https://github.com/adnanh/webhook/blob/2.8.3/webhook.go"
    },
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      "url": "https://github.com/adnanh/webhook/issues/756"
    },
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      "url": "https://github.com/adnanh/webhook/issues/756"
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  "vulnStatus": "Received",
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}

GHSA-4WR8-3XFV-VHJ5

Vulnerability from github – Published: 2026-09-14 18:31 – Updated: 2026-09-14 18:31

Details

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-91080"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T18:20:29Z",
    "severity": "HIGH"
  },
  "details": "webhook through 2.8.3 reads the entire request body into memory before evaluating trigger rules, allowing unauthenticated attackers to exhaust memory by sending oversized bodies. Attackers can send multi-gigabyte request bodies with invalid signatures to trigger out-of-memory conditions and crash the service.",
  "id": "GHSA-4wr8-3xfv-vhj5",
  "modified": "2026-09-14T18:31:29Z",
  "published": "2026-09-14T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91080"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adnanh/webhook/issues/756"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adnanh/webhook"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adnanh/webhook/blob/2.8.3/webhook.go"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/webhook-through-2.8.3-memory-exhaustion-via-oversized-request-body"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

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.

Action not permitted

CVE-2026-91080 (GCVE-0-2026-91080)

FKIE_CVE-2026-91080

GHSA-4WR8-3XFV-VHJ5

Tags

Sightings

Nomenclature