CVE-2026-78594

4.9 mediumEPSS 0.5%

Medium (4.9) in elastic apm server. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.9 medium

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
CWE: CWE-409
Published: 2026-09-02
Modified: 2026-09-03
Record from: the NVD, synced 2026-10-19

Affected

elastic:apm_server

References

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

Check your stack JSON