Cache Poisoning Vulnerability in CoreBunch/Instatic Product
CVE-2026-72587

6.1MEDIUM

Key Information:

Vendor

Corebunch

Status
Instatic
Vendor
CVE Published:
10 August 2026

What is CVE-2026-72587?

A cache poisoning vulnerability exists in CoreBunch/Instatic versions up to 0.0.14. An unauthenticated remote attacker can exploit this flaw by manipulating the 'u' query parameter of the GET /_instatic/hole/ endpoint, potentially affecting the shared process-wide render cache. This allows attackers to inject malicious content, compromising the integrity and security of affected systems.

Affected Version(s)

Instatic 0 <= 0.0.14

References

https://github.com/CoreBunch/Instatic
third-party-advisory

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Komiljon Ayubov
.