What is GHSA-5q8h-fhcg-2395?

GHSA-5q8h-fhcg-2395 is a security advisory published by GitHub Security Advisories with Medium severity. Improper handling of highly compressed data (data amplification) in Checkmk \u003c2.5.0p14, \u003c2.4.0p37,...

Which CVE IDs does GHSA-5q8h-fhcg-2395 cover?

GHSA-5q8h-fhcg-2395 covers the following CVE IDs: CVE-2026-77021. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-5q8h-fhcg-2395Medium

Improper handling of highly compressed data (data amplification) in Checkmk <2.5.0p14, <2.4.0p37,...

Vendor

GitHub Security Advisories

Published

September 21, 2026

Last Modified

September 21, 2026

🔗 CVE IDs covered (1)

CVE-2026-77021 →

📋 Description

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.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-77021
https://checkmk.com/werk/22116
https://github.com/advisories/GHSA-5q8h-fhcg-2395