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CVE-2026-78594— Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service

Quick assessment

Affected
Elastic Apm Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic APM Server是荷兰Elastic公司开源的一套应用性能监测服务器。 Elastic APM Server 8.0.0至8.19.19版本、9.0.0至9.4.4版本和9.5.0版本存在资源管理错误漏洞，该漏洞源于对高度压缩数据处理不当，可能导致具有写权限的认证用户存储特制的高度压缩内容，在后续处理时耗尽APM Server可用内存并终止进程，造成持久拒绝服务。

CVSS 4.9 · Medium EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
Elastic Apm Server 8.0.0≤ 8.19.19 affected
9.0.0≤ 9.4.4 affected
9.5.0 affected
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I. Basic Information for CVE-2026-78594

Vulnerability Information
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Vulnerability Title
Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic APM Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic APM Server是荷兰Elastic公司开源的一套应用性能监测服务器。 Elastic APM Server 8.0.0至8.19.19版本、9.0.0至9.4.4版本和9.5.0版本存在资源管理错误漏洞，该漏洞源于对高度压缩数据处理不当，可能导致具有写权限的认证用户存储特制的高度压缩内容，在后续处理时耗尽APM Server可用内存并终止进程，造成持久拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Apm Server 8.0.0 ~ 8.19.19 -

II. Public POCs for CVE-2026-78594

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III. Intelligence Information for CVE-2026-78594

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Vendor Advisories for CVE-2026-78594 (1)

Same Patch Batch · Elastic · 2026-09-02 · 15 CVEs total

CVE-2026-78604 7.8 HIGH Incorrect Permission Assignment for Critical Resource in Elastic Agent Leading to Local Pr
CVE-2026-78590 7.3 HIGH Improper Limitation of a Pathname to a Restricted Directory in Kibana Leading to Unauthori
CVE-2026-78588 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Filebeat Leading to Denial of Serv
CVE-2026-78586 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-78599 6.5 MEDIUM Stored Path Traversal in Kibana Leading to Unauthorized Deletion of Internal Resources
CVE-2026-78591 6.3 MEDIUM Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Kibana L
CVE-2026-78601 5.5 MEDIUM Missing Authorization in Kibana Leading to Unauthorized Elasticsearch Index Data Exposure
CVE-2026-78598 5.4 MEDIUM Incorrect Authorization in Kibana Leading to Unauthorized Cross-Space Exposure of Machine
CVE-2026-78609 5.4 MEDIUM Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modificatio
CVE-2026-78602 5.3 MEDIUM Improper Limitation of a Pathname to a Restricted Directory in Elastic Maps Server Leading
CVE-2026-82293 4.3 MEDIUM Incorrect Authorization in Kibana Leading to Unauthorized Resource Consumption
CVE-2026-78584 4.3 MEDIUM Observable Response Discrepancy in Kibana Leading to Cross-Space Information Disclosure
CVE-2026-78600 3.5 LOW Incomplete Cleanup in Elastic Cloud on Kubernetes Leading to Unauthorized Cross-Namespace
CVE-2026-78587 3.1 LOW Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Opera

IV. Related Vulnerabilities

Same product: Apm Server
Same vendor: Elastic
Same weakness: CWE-409

V. Comments for CVE-2026-78594

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