Vulnerability · Published Sep 2, 2026 · Assigned by elastic
CVE-2026-78594Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service
Medium 4.9
In plain English
A medium-severity security flaw in Apm Server from Elastic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Apm Server | 8.0.0 – through 8.19.199.0.0 – through 9.4.49.5.0 |
Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H