TI-2026-54643 Aliases CVE-2026-78594 GHSA-5jf2-hccc-p8fm

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

LOW 23CWE-409Published 2026-09-02 · Updated 2026-09-02

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.005 43rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Elastic	Apm Server	8.0.0 – 8.19.19; 9.0.0 – 9.4.4; 9.5.0	—	No fix listed	CNA

Apm Server VendorElastic Affected 8.0.0 – 8.19.19; 9.0.0 – 9.4.4; 9.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:elastic:apm_server::::::::	8.0.0 to before 8.19.20; 9.0.0 to before 9.4.5	Vulnerable	Elastic
cpe:2.3:a:elastic:apm_server:9.5.0:::::::*	9.5.0	Vulnerable	Elastic

cpe:2.3:a:elastic:apm_server:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.19.20; 9.0.0 to before 9.4.5 Vulnerable ·Elastic
cpe:2.3:a:elastic:apm_server:9.5.0:*:*:*:*:*:*:* Versions 9.5.0 Vulnerable ·Elastic

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-78594
2026-10-03 Alias added: GHSA-5jf2-hccc-p8fm

References

Advisory 1

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

TI-2024-15495 APM Server Insertion of Sensitive Information into Log File CVSS 3.1HIGH 7.5
TI-2023-15038 Beats, Elastic Agent, APM Server, and Fleet Server Improper Certificate Validation issue CVSS 3.1HIGH 7.5
TI-2024-24801 APM Server Insertion of Sensitive Information into Log File CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences