CVE-2026-78594CWE-409

CVE-2026-78594

Medium · published September 2, 2026

CVSS v3.1
4.9
EPSS
1%
Percentile
41.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00500 · 41.9th percentile
Weakness
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
Published
2026-09-02T19:17Z
Affected products (3)
ProductVersionsFixed in
elastic/apm_server≥ 8.0.0, < 8.19.208.19.20
elastic/apm_server≥ 9.0.0, < 9.4.59.4.5
elastic/apm_serverall versions—
References (1)
https://discuss.elastic.co/t/apm-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-152/390110 · [email protected]
EPSS history
Timeline
  • 04 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 02 SEP 14:43Z
    Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service
    cvelistv5