Description
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.
Published: 2026-08-10
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
Link Providers
https://github.com/CoreBunch/Instatic cve-icon cve-icon
History

Tue, 11 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Corebunch
Corebunch instatic
Vendors & Products Corebunch
Corebunch instatic

Mon, 10 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 10 Aug 2026 12:00:00 +0000

Type Values Removed Values Added
Description 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. The originating-page URL supplied in u seeds the route template frame used for rendering, and the result is stored in a shared cache keyed only on nodeId, enabling an attacker to inject a crafted route that causes all subsequent visitors to receive malformed or attacker-controlled fragment content. 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.

Mon, 10 Aug 2026 11:00:00 +0000

Type Values Removed Values Added
Description 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. The originating-page URL supplied in u seeds the route template frame used for rendering, and the result is stored in a shared cache keyed only on nodeId, enabling an attacker to inject a crafted route that causes all subsequent visitors to receive malformed or attacker-controlled fragment content.
Title Instatic - Cache Poisoning via Unauthenticated Server Island Endpoint
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Subscriptions

Corebunch Instatic
cve-icon MITRE

Status: PUBLISHED

Assigner: TuranSec

Published:

Updated: 2026-08-10T13:21:33.909Z

Reserved: 2026-08-10T10:32:53.854Z

Link: CVE-2026-72587

cve-icon Vulnrichment

Updated: 2026-08-10T13:21:28.964Z

cve-icon NVD

Status : Received

Published: 2026-08-10T11:17:31.760

Modified: 2026-08-10T14:17:30.267

Link: CVE-2026-72587

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-11T14:23:35Z

Weaknesses