What is CVE-2026-72587?

CVE-2026-72587 is a medium-severity vulnerability in Corebunch Instatic, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 6.1/10. Published 2026-08-10.

How severe is CVE-2026-72587?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Corebunch Instatic

CVE-2026-72587

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…

Vulnerability class: HTTP Request Smuggling

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Corebunch Instatic — versions 0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-72587?: CVE-2026-72587 is a medium-severity vulnerability in Corebunch Instatic, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 6.1/10. Published 2026-08-10.
How severe is CVE-2026-72587?: Medium severity. CVSS v3 base score is 6.1 out of 10.