CVE-2026-77021 — Missing decompression size limit in agent receiver allows memory exhaustion via push agent data
Improper handling of highly compressed data (data amplification) in Checkmk <2.5.0p14, <2.4.0p37, <2.3.0p51 and 2.2.0 (EOL) allows an attacker who controls a host registered for…
Published: 2026-09-21 · CVSS: 5.3 · CVSS 4.0
Improper handling of highly compressed data (data amplification) in Checkmk <2.5.0p14, <2.4.0p37, <2.3.0p51 and 2.2.0 (EOL) allows an attacker who controls a host registered for push mode to exhaust the memory of the agent receiver by sending a small zlib compressed payload that decompresses to an arbitrary size.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7