CVE-2026-72587 MEDIUM

CVE-2026-72587: Instatic - Cache Poisoning via Unauthenticated Server Island Endpoint

Vendor Corebunch

Product Instatic

Weakness CWE-444

Published August 10, 2026

Last update August 10, 2026

View on NVD All CVEs

CVSS base score

6.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 10, 2026 CVE published

August 10, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-72587 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/444.html AskarLabs — CWE-444 write-up Inconsistent Interpretation of HTTP Requests (Request Smuggling)