Is CVE-2026-121727 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121727?

CVE-2026-121727 has a CVSS v3 severity of HIGH (7.5).

Back

CVE-2026-121727

Description

Kore before 4.3.0 contains an integer underflow vulnerability in HTTP request body handling that allows unauthenticated attackers to bypass http_body_max by sending more body bytes than declared. Attackers can send oversized first segments over many concurrent POST, PUT or DELETE connections, wrapping content_length to grow buffers unbounded and exhaust worker memory.