CVE-2026-77021
Missing decompression size limit in agent receiver allows memory exhaustion via push agent data
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-409 |
| Vendor | checkmk gmbh |
| Product | checkmk |
| Published | Sep 21, 2026 |
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Affected Versions
Checkmk GmbH / Checkmk
2.5.0 < 2.5.0p14 2.4.0 < 2.4.0p37 2.3.0 < 2.3.0p51 2.2.0
Credits
🔍 Sven Jäger (SySS GmbH)