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CVE-2026-118489— CachingWebClient shares user-specific HTTP responses across users via the shared cache tier

Quick assessment

Affected
Eclipse Foundation Eclipse Vert.x
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.

在 Eclipse Vert.x 版本 [4.0.0, 4.5.35] 或 [5.0.0, 5.2.2] 中，当多个用户共享同一个 实例时（即文档中推荐的模式：为每个用户创建独立的 ，并基于一个共享的缓存客户端），若某个响应仅属于特定用户、可被缓存且未标记为 或 ，则该响应会被存储到客户端级别的共享缓存层中，并可能被提供给请求相同 URL 的其他用户。后续用户的会话，或通过同一客户端发起的匿名调用者，可能会接收到先前用户的响应。根据响应内容的不同，这可能导致已认证内容的泄露或会话 Cookie 的泄露；后者可被利用

CVSS 7.5 · High
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I. Basic Information for CVE-2026-118489

Vulnerability Information
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Vulnerability Title
CachingWebClient shares user-specific HTTP responses across users via the shared cache tier
Source: CVE Program / CVE List V5
Vulnerability Description
In Eclipse Vert.x versions [4.0.0,4.5.35] or [5.0.0,5.2.2], when one `CachingWebClient` is shared across users — the documented pattern of a per-user `WebClientSession` over a shared caching client — a response that is specific to one user but is cacheable and not marked `private`/`no-store` is stored in the client-level shared cache tier and served to other users requesting the same URL. A later user's session, or an anonymous caller through the same client, can receive an earlier user's response. Depending on the response this discloses authenticated content or a session cookie, the latter enabling session fixation or hijacking.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse Vert.x 4.0.0 ~ 4.5.35 -

II. Public POCs for CVE-2026-118489

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III. Intelligence Information for CVE-2026-118489

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Other References for CVE-2026-118489 (2)

Same Patch Batch · Eclipse Foundation · 2026-11-03 · 9 CVEs total

CVE-2026-89292 9.2 CRITICAL Unauthenticated SSRF with MNESTIX_BACKEND_API_KEY disclosure in Eclipse Mnestix Browser se
CVE-2026-89293 8.8 HIGH Missing server-side authorization in Eclipse Mnestix Browser admin server actions allows u
CVE-2026-115231 8.5 HIGH User-mode module can post forged callback requests to another module's callback queue, run
CVE-2026-118487 7.5 HIGH Heap exhaustion via unbounded line accumulation in Vert.x STOMP FrameParser
CVE-2026-113421 7.3 HIGH ThreadX Modules invokes trace-full callbacks after module unload
CVE-2026-118488 5.9 MEDIUM Heap exhaustion via unbounded simple string or bulk string allocation in Vert.x Redis clie
CVE-2026-92610 Improper limitation of paths in py-aspect-model-loader
CVE-2026-89295 Unauthenticated memory-exhaustion denial of service in Eclipse Mnestix AAS Generator unbou

IV. Related Vulnerabilities

Same product: Eclipse Vert.x
Same vendor: Eclipse Foundation
Same weakness: CWE-200