An application using Micrometer Tracing with W3C baggage propagation in the Brave bridge is vulnerable to denial of service (DoS) due to unbounded object allocation when extracting incoming baggage headers.
Specifically, an application is vulnerable when all the following are true:
* The application uses a vulnerable version of io.micrometer:micrometer-tracing-bridge-brave.
* W3C propagation is active (either configured manually or active by default, such as in Spring Boot 3.x+).
* Baggage propagation is enabled (which is the default in Spring Boot 3.x+) and a baggage manager (such as BraveBaggageManager) is configured to handle baggage fields.
* The application processes requests or messages from untrusted sources with baggage headers which it normally should not, see: https://www.w3.org/TR/trace-context/#security-considerations .
* Network components including the (HTTP) server that receives the request do not limit the header size or the limit is high enough to cause issues.
The last two points are very important: normally this should not affect applications because they should not receive untrusted and unlimited input for baggage.
* The application processes requests or messages from untrusted sources with baggage headers.
When extracting baggage from the W3C baggage header, incoming entries are parsed without enforcing limits on the number of entries or header size as mandated by the W3C Baggage specification. An attacker can send requests or messages with artificially inflated baggage headers containing many key-value pairs, causing unconditional BaggageField allocations per entry. This leads to garbage collection pressure, high CPU usage, and potential application crash via OutOfMemoryError.
Specifically, an application is vulnerable when all the following are true:
* The application uses a vulnerable version of io.micrometer:micrometer-tracing-bridge-brave.
* W3C propagation is active (either configured manually or active by default, such as in Spring Boot 3.x+).
* Baggage propagation is enabled (which is the default in Spring Boot 3.x+) and a baggage manager (such as BraveBaggageManager) is configured to handle baggage fields.
* The application processes requests or messages from untrusted sources with baggage headers which it normally should not, see: https://www.w3.org/TR/trace-context/#security-considerations .
* Network components including the (HTTP) server that receives the request do not limit the header size or the limit is high enough to cause issues.
The last two points are very important: normally this should not affect applications because they should not receive untrusted and unlimited input for baggage.
* The application processes requests or messages from untrusted sources with baggage headers.
When extracting baggage from the W3C baggage header, incoming entries are parsed without enforcing limits on the number of entries or header size as mandated by the W3C Baggage specification. An attacker can send requests or messages with artificially inflated baggage headers containing many key-value pairs, causing unconditional BaggageField allocations per entry. This leads to garbage collection pressure, high CPU usage, and potential application crash via OutOfMemoryError.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VMware | Spring | affected |
|
No data.
No data.
OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.
| Vendors | Products |
|---|---|
|
Vmware
Subscribe
|
Spring
Subscribe
|
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
| Link | Providers |
|---|---|
| https://spring.io/security/cve-2026-59323 |
|
History
Fri, 21 Aug 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Vmware
Vmware spring |
|
| Weaknesses | CWE-749 | |
| Vendors & Products |
Vmware
Vmware spring |
Fri, 21 Aug 2026 10:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An application using Micrometer Tracing with W3C baggage propagation in the Brave bridge is vulnerable to denial of service (DoS) due to unbounded object allocation when extracting incoming baggage headers. Specifically, an application is vulnerable when all the following are true: * The application uses a vulnerable version of io.micrometer:micrometer-tracing-bridge-brave. * W3C propagation is active (either configured manually or active by default, such as in Spring Boot 3.x+). * Baggage propagation is enabled (which is the default in Spring Boot 3.x+) and a baggage manager (such as BraveBaggageManager) is configured to handle baggage fields. * The application processes requests or messages from untrusted sources with baggage headers which it normally should not, see: https://www.w3.org/TR/trace-context/#security-considerations . * Network components including the (HTTP) server that receives the request do not limit the header size or the limit is high enough to cause issues. The last two points are very important: normally this should not affect applications because they should not receive untrusted and unlimited input for baggage. * The application processes requests or messages from untrusted sources with baggage headers. When extracting baggage from the W3C baggage header, incoming entries are parsed without enforcing limits on the number of entries or header size as mandated by the W3C Baggage specification. An attacker can send requests or messages with artificially inflated baggage headers containing many key-value pairs, causing unconditional BaggageField allocations per entry. This leads to garbage collection pressure, high CPU usage, and potential application crash via OutOfMemoryError. | |
| Title | Micrometer Tracing Brave Bridge W3C Baggage propagation DoS vulnerability | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
Sign in to view the affected projects.
MITRE
Status: PUBLISHED
Assigner: vmware
Published:
Updated: 2026-08-21T10:01:05.831Z
Reserved: 2026-07-04T18:14:10.167Z
Link: CVE-2026-59323
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-08-21T10:16:38.910
Modified: 2026-08-21T10:16:38.910
Link: CVE-2026-59323
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-08-21T11:30:04Z
Weaknesses