CVE-2026-78594
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
Improper handling of highly compressed data in APM Server can lead to persistent denial of service. An authenticated user with write access to source map content could store specially crafted, highly compressed content that exhausts memory when processed, terminating the process. The condition recurs on every restart until the stored content is removed.
Risk Assessment
Risk of persistent unavailability of APM Server, potentially disrupting application performance monitoring and causing outages.
Recommendation
Update APM Server to a patched version and restrict write permissions to source map content.
Other vulnerabilities in APM Server
See all- CVE-2026-115716Medium
APM Server has a CWE-770 (allocation of resources without limits or throttling) vulnerability enabling denial of service via oversized serialized data payloads. An attacker able to send OpenTelemetry (OTLP) data over HTTP can cause memory exhaustion and server termination.
- CVE-2026-115289Medium
Use of Multiple Resources with Duplicate Identifier (CWE-694) in APM Server can lead to information disclosure via a specially crafted agent configuration request. An authenticated APM agent could receive the central agent configuration that belongs to a different service until the cached configuration expires. A service could also run with central configuration settings, such as sampling settings, that were meant for a different service.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS