A Bootiful Podcast: Kubernetes guru Leigh Capili helps us ring in the new year

Hi, Spring fans! And Happy new year! In this episode I talk to Kubernetes guru Leigh Capili, who helps us ring in the new year!...

CDS with Spring Framework 6.1

As a follow-up to the Runtime efficiency with Spring blog post, I am happy to share that our exploration of Project Leyden optimizations has led to some interesting discoveries regarding the JDK's little-used CDS "Class Data Sharing" feature and has materialized into a new feature that we have be...

Spring Boot server Web Observations DoS Vulnerability

In Spring Boot versions 2.7.0 - 2.7.17, 3.0.0-3.0.12 and 3.1.0-3.1.5, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service DoS condition. Specifically, an application is vulnerable when all of the following are true:...

Directory Traversal in Reactor Netty HTTP Server

In Reactor Netty HTTP Server, versions 1.1.x prior to 1.1.13 and versions 1.0.x prior to 1.0.39, a malicious user can send a request using a specially crafted URL that can lead to a directory traversal attack. Specifically, an application is vulnerable if Reactor Netty HTTP Server is configured t...

A Bootiful Podcast: Spring Security and Kubernetes legend Daniel Garnier-Moiroux

Hi, Spring fans! In this installment Josh Long talks to Spring contributor and adjunct professor at Mines Paris, Daniel Garnier-Moiroux @kehrlann, about the wild and wonderful intersection of all things Spring Security and Kubernetes, productized Spring Cloud Services, and more, recorded live at...

This Week in Spring - May 2, 20223

Hi, Spring fans! Welcome to another installment of This Week in Spring! You realize it's already May, 2023? Time's flying, way too quickly! I just got back from Bangalore, India, where I spoke at the amazing Great International Developer Summit, one of the all time best shows ever, and now I'm...

A Bootiful Podcast: Sebastien Deleuze and James Ward on a Bootiful Podcast

Hi, Spring fans! In this installment, recorded live from Kotlin Conf 2023 in Amsterdam, I talk to Kotlin luminaries Sébastien Deleuze and James Ward about Kotlin's future, web assembly, and more...

This Week in Spring - January 17th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! I went to Helsinki, Finland, last week, and this week I'm in Atlanta, Georgia, to speak at the Atlanta Java User Group. And, of course, next week, I'll be in New York to join a viewing party for the airing of SpringOne...

Privilege Escalation in spring-security-oauth2-client

Spring Security, versions 5.7 prior to 5.7.5 , and 5.6 prior to 5.6.9 , and older unsupported versions could be susceptible to a privilege escalation under certain conditions. A malicious user or attacker can modify a request initiated by the Client via the browser to the Authorization Server whi...

Reactor Netty HTTP Server may log request headers

Reactor Netty HTTP Server, in versions 1.0.11 - 1.0.23, may log request headers in some cases of invalid HTTP requests. The logged headers may reveal valid access tokens to those with access to server logs. This may affect only invalid HTTP requests where logging at WARN level is enabled...

Spring Cloud Function Dos Vulnerability

In Spring Cloud Function versions 3.2.5 and older unsupported versions, it is possible for a user who directly interacts with framework provided lookup functionality to cause denial of service condition due to the caching issue in Function Catalog component of the framework. At the time of writin...

This Week in Spring - April 5th, 2022

Hi, Spring fans! Welcome to another installment of This Week in Spring! Im back home from the Hawaiin islands. Its so good to be home. First things first: theres a security vulnerability. Weve already released guidance on how to mitigate as well as new releases of Spring Framework and Spring Boot...

Remote code execution in Spring Cloud Function by malicious Spring Expression

In Spring Cloud Function versions 3.1.6, 3.2.2 and older unsupported versions, when using routing functionality it is possible for a user to provide a specially crafted SpEL as a routing-expression that may result in remote code execution and access to local resources...

Kryo Configuration Allows Code Execution with Unknown “Serialization Gadgets”

Spring Integration framework provides Kryo Codec implementations as an alternative for Java deserialization. When Kryo is configured with default options, all unregistered classes are resolved on demand. This leads to the "deserialization gadgets" exploit when provided data contains malicious cod...

Signature Wrapping Vulnerability with spring-security-saml2-service-provider

Spring Security versions 5.2.x prior to 5.2.4 and 5.3.x prior to 5.3.2 contain a signature wrapping vulnerability during SAML response validation. When using the spring-security-saml2-service-provider component, a malicious user can carefully modify an otherwise valid SAML response and append an...

Authentication Leak On Redirect With Reactor Netty HttpClient

Reactor Netty HttpClient, versions 0.9.x prior to 0.9.5, and versions 0.8.x prior to 0.8.16, may be used incorrectly, leading to a credentials leak during a redirect to a different domain. In order for this to happen, the HttpClient must have been explicitly configured to follow redirects...

CSRF Attack via CORS Preflight Requests with Spring MVC or Spring WebFlux

Spring Framework, versions 5.2.x prior to 5.2.3 are vulnerable to CSRF attacks through CORS preflight requests that target Spring MVC spring-webmvc module or Spring WebFlux spring-webflux module endpoints. Only non-authenticated endpoints are vulnerable because preflight requests should not inclu...

RFD Attack via “Content-Disposition” Header Sourced from Request Input by Spring MVC or Spring WebFlux Application

In Spring Framework, versions 5.2.x prior to 5.2.3, versions 5.1.x prior to 5.1.13, and versions 5.0.x prior to 5.0.16, an application is vulnerable to a reflected file download RFD attack when it sets a “Content-Disposition” header in the response where the filename attribute is derived from use...

Insecure Randomness When Using a SecureRandom Instance Constructed by Spring Security

Spring Security versions 4.2.x prior to 4.2.12, 5.0.x prior to 5.0.12, and 5.1.x prior to 5.1.5 contain an insecure randomness vulnerability when using SecureRandomFactoryBeansetSeed to configure a SecureRandom instance. In order to be impacted, an honest application must provide a seed and make...

Cross Site Tracing (XST) with Spring Framework

Spring Framework versions 5.0.x prior to 5.0.7, versions 4.3.x prior to 4.3.18, and older unsupported versions allow web applications to change the HTTP request method to any HTTP method including TRACE using the HiddenHttpMethodFilter in Spring MVC. If an application has a pre-existing XSS...

JSONP enabled by default in MappingJackson2JsonView

Spring Framework, versions 5.0.x prior to 5.0.7, versions 4.3.x prior to 4.3.18, and older unsupported versions, allows web applications to enable cross-domain requests via JSONP JSON with Padding through AbstractJsonpResponseBodyAdvice for REST controllers, and MappingJackson2JsonView for browse...

Spring Data JPA Blind SQL Injection Vulnerability

Sort instances handed into user defined Spring Data repository query methods using manually declared JPQL queries are handed to the persistence provider as is and allow attackers to inject arbitrary JPQL into ORDER BY clauses which they might use to draw conclusions about non-exposed fields based...

Remote Code Execution (RCE) in Spring Security OAuth

When processing authorization requests using the whitelabel views, the responsetype parameter value was executed as Spring SpEL which enabled a malicious user to trigger remote code execution via the crafting of the value for responsetype...

Spring Social CSRF

When authorizing an application against an OAuth 2 API provider, Spring Social is vulnerable to a Cross-Site Request Forgery CSRF attack. The attack involves a malicious user beginning an OAuth 2 authorization flow using a fake account with an OAuth 2 API provider, but completing it by tricking t...

DoS Attack with XML Input

XML external entities were previously disabled with the publication of http://pivotal.io/security/cve-2013-6429 . If DTD is not entirely disabled, inline DTD declarations can be used to perform Denial of Service attacks known as XML bombs. Such declarations are both well-formed and valid accordin...

Directory Traversal in Spring Framework

Some URLs were not santized correctly before use allowing an attacker to obtain any file on the file system that was also accessible to process in which the Spring web application was running...

CVE-2026-41850

CVE-2026-41850...

CVE-2026-59294

CVE-2026-59294...

CVE-2026-59295

CVE-2026-59295...

CVE-2026-59286

CVE-2026-59286...

cve-2026-47837 - MEDIUM - Spring Cloud Config Server Monitor Endpoint Does Not Validate Webhook Requests

cve-2026-47837 - MEDIUM - Spring Cloud Config Server Monitor Endpoint Does Not Validate Webhook Requests...

cve-2026-47850 - MEDIUM - Spring Data REST allows mutation of the version property of immutable aggregates via PUT

cve-2026-47850 - MEDIUM - Spring Data REST allows mutation of the version property of immutable aggregates via PUT...

cve-2026-47843 - LOW - Reactor Netty may incorrectly route traffic due to DNS resolver reuse

cve-2026-47843 - LOW - Reactor Netty may incorrectly route traffic due to DNS resolver reuse...

cve-2026-59279 - HIGH - Unbounded persistent session allocation via repeated initialize requests

cve-2026-59279 - HIGH - Unbounded persistent session allocation via repeated initialize requests...

cve-2026-47880 - MEDIUM - DefaultJmsHeaderMapper copies all JMS user properties into MessageHeaders without excluding framework-significant names

cve-2026-47880 - MEDIUM - DefaultJmsHeaderMapper copies all JMS user properties into MessageHeaders without excluding framework-significant names...

cve-2026-47845 - MEDIUM - Reactor Netty HTTP Server may incorrectly evaluate proxy addresses

cve-2026-47845 - MEDIUM - Reactor Netty HTTP Server may incorrectly evaluate proxy addresses...

This Week in Spring - April 7th, 2026

Hi Spring fans! Welcome to another installment of This Week in Spring! It's April 7th, 2026, and I'm on the road! I started the journey for the amazing Voxxed Days Amsterdam show and am now winding my way through France. I visited Colmar, a beautiful city from which the animators on Disney's Beau...

This Week in Spring - October 21st, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm writing this from the fantastic Vaadin Create conference here in Frankfurt, Germany. What an amazing show and community. Since we last spoke, I have been in Boston; New York city; Sofia, Bulgaria; Krakow, Poland; and now...

Securing MCP Servers with Spring AI

Model Context Protocol, or MCP for short, has taken over the AI world. If you've been following our blog, you've probably read the introduction to the topic, Connect Your AI to Everything: Spring AI's MCP Boot Starters. The security aspects of MCP have been evolving fast, and the latest version o...

A Bootiful Podcast: Java Champion, Tessl Devrel head, friend, Virtual JUG co-founder Simon Maple

Hi, Spring fans! In this episode, we catch up with Java Champion, Tessl Devrel head, Virtual JUG co-founder, and friend Simon Maple! This episode was recorded at the amazing ArcOfAI conference held in amazing Austin, TX!...

A Bootiful Podcast: Spring Boot and Spring Initializr legend Moritz Halbritter

Hi, Spring fans! In this installment I talk to Spring Boot and Spring Initializr legend Moritz Halbritter...

A Bootiful Podcast: HTMX creator Carson Gross

Hi, Spring and HTML fans! Today I talk to hypermedia enjoyer Carson Gross, creator of the ever popular HTMX library which eschews a ton of the complexity associated with building client side applications...

Building Effective Agents with Spring AI (Part 1)

In a recent research publication: Building effective agents, Anthropic shared valuable insights about building effective Large Language Model LLM agents. What makes this research particularly interesting is its emphasis on simplicity and composability over complex frameworks. Let's explore how...

A Bootiful Podcast: Dr. Dave Syer on the new and nifty Spring gRPC project

Hi, Spring fans! In this installment I talk to the good and the great Dr. Dave Syer about the experimental! new Spring gRPC project!...

A Bootiful Podcast: PostgreSQL contributor Dave Cramer

Hi, Spring fans! Happy Thanksgiving to my American listeners! and happy Thursday to the everyone! In today's episode I talk to PostgreSQL and PostgreSQL JDBC contributor Dave Cramer. postgresql jdbc sql java...

Spring LDAP Spring LDAP sensitive data exposure for case-sensitive comparisons

The usage of String.toLowerCase and String.toUpperCase has some Locale dependent exceptions that could potentially result in unintended columns from being queried Related to CVE-2024-38820...

This Week in Spring - November 5th, 2024

This Week in Spring - November 5th, 2024 Hi, Spring fans! Welcome to another installment of This Week in Spring! It's the 5th of November, 2024, and, um, I - an American - am desperately trying to keep calm and carry on. I did everything I can do VOTE!, and so it's with considerable enthusiasm th...

A Bootiful Podcast: GraalVM founder and BDFL Thomas Wuerthinger on GraalPy, GraalVM, and so much more

Hi, Spring fans! In this installment I talk to GraalVM founder and benevolent dictator for life Thomas Wuerthinger, recorded live from Devoxx Belgium 2024!...

Missing Authorization When Using @AuthorizeReturnObject

Applications using @AuthorizeReturnObject or the Spring Security produced AuthorizationAdvisorProxyFactory @Bean to wrap objects may not have all security advice applied. When method security advice is not applied, it means that annotations like @PreFilter and @PreAuthorize may take no affect on...

Spring Framework URL Parsing with Host Validation

Applications that use UriComponentsBuilder to parse an externally provided URL e.g. through a query parameter AND perform validation checks on the host of the parsed URL may be vulnerable to a open redirect attack or to a SSRF attack if the URL is used after passing validation checks...