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CVE-2026-59279— Unbounded persistent session allocation via repeated initialize requests

Quick assessment

Affected
Spring Spring AI
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 AI是美国Spring公司的一款人工智能框架。 Spring AI 2.0.0版本存在资源管理错误漏洞，该漏洞源于MCP Streamable HTTP服务器传输（WebFlux和WebMvc变体）未限制保留的会话数量且默认不要求客户端身份验证，远程攻击者可利用此漏洞导致服务器累积无限会话，逐渐耗尽内存，最终造成拒绝服务，影响所有合法客户端。

CVSS 7.5 · High EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
Spring Spring AI 2.0.0 affected
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I. Basic Information for CVE-2026-59279

Vulnerability Information
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Vulnerability Title
Unbounded persistent session allocation via repeated initialize requests
Source: CVE Program / CVE List V5
Vulnerability Description
The MCP Streamable HTTP server transport (WebFlux and WebMvc variants) does not place any limit on the number of sessions it retains, and by default does not require clients to be authenticated. As a result, a remote attacker can cause the server to accumulate an unbounded number of sessions over time, gradually exhausting available memory and ultimately causing a Denial of Service that affects all legitimate clients. Affected versions: Spring AI: 2.0.0
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Spring AI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Spring AI是美国Spring公司的一款人工智能框架。 Spring AI 2.0.0版本存在资源管理错误漏洞，该漏洞源于MCP Streamable HTTP服务器传输（WebFlux和WebMvc变体）未限制保留的会话数量且默认不要求客户端身份验证，远程攻击者可利用此漏洞导致服务器累积无限会话，逐渐耗尽内存，最终造成拒绝服务，影响所有合法客户端。
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 AI 2.0.0 -

II. Public POCs for CVE-2026-59279

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III. Intelligence Information for CVE-2026-59279

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Vendor Advisories for CVE-2026-59279 (1)

Same Patch Batch · Spring · 2026-08-21 · 5 CVEs total

CVE-2026-59318 6.5 MEDIUM DefaultToolCallingManager Global Resolver Fallback Allows Unadvertised Tool Dispatch via P
CVE-2026-59296 5.9 MEDIUM Micrometer StatsD and Logging meter registries line-protocol and log injection vulnerabili
CVE-2026-59323 5.3 MEDIUM Micrometer Tracing Brave Bridge W3C Baggage propagation DoS vulnerability
CVE-2026-59308 4.2 MEDIUM Semantic Cache Cross-Tenant Isolation Bypass via SHA-256 Truncation

IV. Related Vulnerabilities

Same product: Spring AI
Same vendor: Spring
Same weakness: CWE-770

V. Comments for CVE-2026-59279

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