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CVE-2026-40988— Unbounded DEFLATE Inflation in SAML 2.0 Service Provider

Quick assessment

Affected
Spring Spring Security
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.

Spring Security是Spring开源的一款具有认证和授权功能的安全框架。 Spring Security存在资源管理错误漏洞，该漏洞源于使用spring-security-saml2-service-provider和REDIRECT绑定时，无界写入器将压缩的SAML有效载荷膨胀到内存中，可能导致拒绝服务。以下版本受到影响：5.7.0至5.7.23版本、5.8.0至5.8.25版本、6.3.0至6.3.16版本、6.4.0至6.4.16版本、6.5.0至6.5.10版本和7.0.0至7.0.5

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Spring Spring Security 5.7.0< 5.7.24 affected
5.8.0< 5.8.26 affected
6.3.0< 6.3.17 affected
6.4.0< 6.4.17 affected
6.5.0< 6.5.10.2 affected
7.0.0< 7.0.5.1 affected
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I. Basic Information for CVE-2026-40988

Vulnerability Information
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Vulnerability Title
Unbounded DEFLATE Inflation in SAML 2.0 Service Provider
Source: CVE Program / CVE List V5
Vulnerability Description
An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Spring Security 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Spring Security是Spring开源的一款具有认证和授权功能的安全框架。 Spring Security存在资源管理错误漏洞，该漏洞源于使用spring-security-saml2-service-provider和REDIRECT绑定时，无界写入器将压缩的SAML有效载荷膨胀到内存中，可能导致拒绝服务。以下版本受到影响：5.7.0至5.7.23版本、5.8.0至5.8.25版本、6.3.0至6.3.16版本、6.4.0至6.4.16版本、6.5.0至6.5.10版本和7.0.0至7.0.5
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Spring Spring Security 5.7.0 ~ 5.7.24 -

II. Public POCs for CVE-2026-40988

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III. Intelligence Information for CVE-2026-40988

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Vendor Advisories for CVE-2026-40988 (1)

Same Patch Batch · Spring · 2026-06-09 · 51 CVEs total

CVE-2026-41717 8.1 HIGH Spring Data MongoDB - SpEL Expression Injection via Annotated Query Parameter Binding
CVE-2026-41732 8.1 HIGH In Spring for Apache Pulsar, overly broad trusted-package matching in header mapper expose
CVE-2026-41855 8.1 HIGH Spring Framework Unsafe Deserialization via Jackson JMS Converters
CVE-2026-41729 8.1 HIGH Spring Data REST SpEL Injection via Map Key in JSON Patch
CVE-2026-41731 8.1 HIGH In Spring for Apache Kafka, overly broad trusted-package matching in header mappers expose
CVE-2026-41003 7.6 HIGH Unencoded HTML Outputs in Spring Security May Allow Cross-Site Scripting
CVE-2026-41728 7.5 HIGH Spring Data REST JSON Patch bypasses Jackson read-only property protection on nested objec
CVE-2026-40983 7.5 HIGH Micrometer gRPC server instrumentation DoS vulnerability
CVE-2026-40984 7.5 HIGH Micrometer HTTP server instrumentations DoS vulnerability
CVE-2026-41850 7.5 HIGH Spring Framework Algorithmic Denial of Service via SpEL Expressions
CVE-2026-41716 7.5 HIGH Spring Data web support unbounded negative-result cache keyed on attacker-supplied propert
CVE-2026-41695 7.5 HIGH Denial of Service in Spring Data Commons Property Path Resolution
CVE-2026-41849 7.5 HIGH Spring Framework Denial of Service via Integer Overflow in SpEL Expressions
CVE-2026-41006 7.5 HIGH Spring HATEOAS Collection+JSON/UBER deserializers do not honor Jackson configuration
CVE-2026-41007 7.5 HIGH Spring HATEOAS heap exhaustion through unbounded internal caching
CVE-2026-41842 7.5 HIGH Spring Framework Denial of Service via Versioned Resources in Spring MVC and WebFlux
CVE-2026-41720 7.4 HIGH Authentication Bypass with Empty Password in Spring LDAP
CVE-2026-40993 7.3 HIGH Unfiltered Java Native Deserialization of SAML 2.0 Asserting Party Credentials BLOB Databa
CVE-2026-41845 7.1 HIGH Spring Framework Cross-site Scripting via JavaScriptUtils
CVE-2026-47838 6.8 MEDIUM Unauthorized User Impersonation when Using X.509 Client Certificates

Showing top 20 of 51 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Spring Security
Same vendor: Spring
Same weakness: CWE-400

V. Comments for CVE-2026-40988

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