CVE-2026-77021 — Missing decompression size limit in agent receiver allows memory exhaustion via push agent data

CVE-2026-77021

Missing decompression size limit in agent receiver allows memory exhaustion via push agent data PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Checkmk GmbH / Checkmk	affected 2.5.0 before 2.5.0p14; affected 2.4.0 before 2.4.0p37; affected 2.3.0 before 2.3.0p51; affected 2.2.0

CWE

CWE-409

References

https://checkmk.com/werk/22116

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.