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CVE-2026-59323— Micrometer Tracing Brave Bridge W3C Baggage propagation DoS vulnerability

Quick assessment

Affected
VMware Spring
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.

使用 Micrometer Tracing 配合 Brave 桥接器中的 W3C 数据载体（baggage）传播功能的应用程序，在提取传入的 baggage 头部时由于对象分配无限制，存在拒绝服务（DoS）漏洞。 具体而言，当同时满足以下所有条件时，应用程序易受此漏洞影响： 应用程序使用了受影响版本的 。 启用了 W3C 传播机制（无论是手动配置还是默认启用，例如 Spring Boot 3.x 及以上版本默认启用）。 启用了数据载体（baggage）传播功能（在 Spring Boot 3.x 及以上版本中为默认

CVSS 5.3 · Medium EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
VMware Spring 1.7.0 - 1.7.0< 1.7.0.1 affected
1.7.0 - 1.7.0< 1.7.1 affected
1.6.0 - 1.6.6< 1.6.6.1 affected
1.6.0 - 1.6.6< 1.6.7 affected
1.5.0 - 1.5.12< 1.5.13 affected
1.4.13 and earlier< 1.4.14 affected
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I. Basic Information for CVE-2026-59323

Vulnerability Information
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Vulnerability Title
Micrometer Tracing Brave Bridge W3C Baggage propagation DoS vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
VMware Spring 1.7.0 - 1.7.0 ~ 1.7.0.1 -

II. Public POCs for CVE-2026-59323

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III. Intelligence Information for CVE-2026-59323

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Vendor Advisories for CVE-2026-59323 (1)

IV. Related Vulnerabilities

Same product: Spring
Same vendor: VMware

V. Comments for CVE-2026-59323

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