CVE-2026-78594

Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service

State: Published
Severity: 4.9 Medium
Published: Sep 2, 2026
Updated: Sep 2, 2026
Reserved: Aug 24, 2026

Description

Improper Handling of Highly Compressed Data (CWE-409) in APM Server can lead to a persistent denial of service via Excessive Allocation (CAPEC-130). An authenticated user with write access to source map content could store specially crafted, highly compressed content that exhausts the memory available to APM Server when it is later processed, terminating the process. The condition recurs on every restart until the stored content is removed.

Scores

CVSS	Score	Vector	Source
3.1	4.9 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

Affected Products

Product	Versions
Apm ServerElastic	8.0.0 through 8.19.19Affected 9.0.0 through 9.4.4Affected 9.5.0Affected

References

https://discuss.elastic.co/t/apm-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-152/390110

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