---
id: CVE-2026-91080
title: >-
  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
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 inva…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: adnanh
product: webhook
affected:
  - webhook <= 2.8.3
published: '2026-09-14'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:44.733'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91080'
references:
  - url: 'https://github.com/adnanh/webhook'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/adnanh/webhook/blob/2.8.3/webhook.go'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/adnanh/webhook/issues/756'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/webhook-through-2.8.3-memory-exhaustion-via-oversized-request-body
    label: disclosure@vulncheck.com
  - url: 'https://github.com/adnanh/webhook/issues/756'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00658
epssPercentile: 0.4936
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-14T19:09:17.000105Z'
ingestedAt: '2026-09-14T19:13:23.464Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.