CVE-2026-78594 PUBLISHED

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

Assigner: elastic
Reserved: 24.08.2026 Published: 02.09.2026 Updated: 02.09.2026

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.

Metrics

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

Product Status

Vendor Elastic
Product Apm Server
Versions Default: unaffected
  • affected from 8.0.0 to 8.19.19 (incl.)
  • affected from 9.0.0 to 9.4.4 (incl.)
  • Version 9.5.0 is affected

References

Problem Types

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

Impacts

  • CAPEC-130 Excessive Allocation