CVE-2026-78594
Medium
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.
SeverityMedium
CVSS4.9
Exploit probability—
ProductElastic Apm Server
PublishedSep 2, 2026
First seenSep 2, 2026
Weakness typeCWE-409CWE-409
How to fix
Update
- elastic apm_server8.19.20, 9.4.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| elastic apm_server | 8.0.0 ≤ v < 8.19.20, 9.0.0 ≤ v < 9.4.5, 9.5.0 | 8.19.20, 9.4.5 |
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