---
id: CVE-2026-72587
title: >-
  A cache poisoning vulnerability in CoreBunch/Instatic through 0.0.14 allows an
  unauthenticated remote attacker to poison the shared process-wide render cache
  by manipulating the u query parameter of the GET /_instatic/hole/<nodeId>
  serve…
summary: >-
  A cache poisoning vulnerability in CoreBunch/Instatic through 0.0.14 allows an
  unauthenticated remote attacker to poison the shared process-wide render cache
  by manipulating the u query parameter of the GET /_instatic/hole/<nodeId>
  serve…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-444
published: '2026-08-10'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72587'
references:
  - url: 'https://github.com/CoreBunch/Instatic'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
tags:
  - nvd
epss: 0.00185
epssPercentile: 0.0837
ingestedAt: '2026-08-29T17:39:55.793Z'
---

## Overview

A cache poisoning vulnerability in CoreBunch/Instatic through 0.0.14 allows an unauthenticated remote attacker to poison the shared process-wide render cache by manipulating the u query parameter of the GET /_instatic/hole/<nodeId> server island endpoint.

## Remediation

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