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CVE-2026-54266— Angular: Weak 32-Bit Cache Key Hashing in `HttpTransferCache` Leading to Cross-Request Data Leakage and State Poisoning

Quick assessment

Affected
angular angular
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.

Angular是Angular组织开源的一个开发平台。用于使用 Typescript / JavaScript 和其他语言构建移动和桌面 Web 应用程序。 Angular存在安全漏洞，该漏洞源于HttpTransferCache使用32位弱哈希生成缓存键，导致哈希碰撞，攻击者可利用特制参数使SSR响应覆盖敏感端点的缓存。

AI Predicted 7.5 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 4

VendorProduct Version RangeStatus
angular angular >= 22.0.0-next.0 < 22.0.1 affected
>= 21.0.0-next.0 < 21.2.17 affected
>= 20.0.0-next.0 < 20.3.25 affected
<= 19.2.25 affected
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I. Basic Information for CVE-2026-54266

Vulnerability Information
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Vulnerability Title
Angular: Weak 32-Bit Cache Key Hashing in `HttpTransferCache` Leading to Cross-Request Data Leakage and State Poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.1, 21.2.17, and 20.3.25, Angular's HttpTransferCache caches HTTP requests made during Server-Side Rendering (SSR) so that they can be reused during client-side hydration. This avoids repeating the same HTTP requests on the client. The cached responses are stored in TransferState using a cache key generated by hashing request properties (method, response type, mapped URL, serialized body, and sorted query parameters). The cache keys are generated using a weak 32-bit DJB2-like polynomial rolling hash. The 32-bit hash space is extremely small, allowing attackers to find hash collisions. An attacker can easily find a query parameter string (e.g., q=aaCAZMMM for a search request) that produces the exact same 32-bit hash as a sensitive endpoint (e.g., /api/user/profile). When a victim visits a crafted link containing the colliding parameter, the SSR process executes both the search request and the profile request. Due to the hash collision, the search response overwrites the profile response in the TransferState cache. This vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
Source: CVE Program / CVE List V5
Vulnerability Title
Angular 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Angular是Angular组织开源的一个开发平台。用于使用 Typescript / JavaScript 和其他语言构建移动和桌面 Web 应用程序。 Angular存在安全漏洞，该漏洞源于HttpTransferCache使用32位弱哈希生成缓存键，导致哈希碰撞，攻击者可利用特制参数使SSR响应覆盖敏感端点的缓存。
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
angular angular >= 22.0.0-next.0 < 22.0.1 -

II. Public POCs for CVE-2026-54266

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III. Intelligence Information for CVE-2026-54266

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Patches & Fixes for CVE-2026-54266 (2)

Vendor Advisories for CVE-2026-54266 (1)

Same Patch Batch · angular · 2026-06-22 · 17 CVEs total

CVE-2026-52725 Angular Template and Dynamic Component Namespace Bypass leading to Cross-Site Scripting (X
CVE-2026-54265 Angular: Two-Way Property Binding Sanitization Bypass (XSS)
CVE-2026-54268 Angular: Denial of Service (DoS) via OOM in Date Formatting (formatDate)
CVE-2026-54264 Angular: Sensitive Header Leakage on Cross-Origin Redirects in Angular Service Worker
CVE-2026-54267 Angular Client Hydration DOM Clobbering & Response-Cache Poisoning
CVE-2026-49241 Angular: Multiple Remote Code Execution Vulnerabilities in Angular Language Service VS Cod
CVE-2026-50171 Angular: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)
CVE-2026-50169 Angular Service Worker Policy-Bypass & Credential-Stripping Vulnerabilities
CVE-2026-50557 Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
CVE-2026-50168 Angular: URL Parser Differential in @angular/platform-server leading to SSRF Allowlist Byp
CVE-2026-50556 Angular: Missing `<noscript>` Raw-Text Serialization Escaping leads to Cross-Site Scriptin
CVE-2026-50555 Angular: Improper Neutralization of Input During Web Page Generation ('Cross-site Scriptin
CVE-2026-50184 Angular: Request Credential & Cache Policy Stripping in Angular Service Worker
CVE-2026-50170 Angular: Information Leak via Default Caching of Credentialed Requests in HttpTransferCach
CVE-2026-50178 Angular: Remote Code Execution via JSDoc Hover Command Injection in VS Code Angular Langua
CVE-2026-46417 Angular: SSRF via Hostname Hijacking in @angular/platform-server

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-328

V. Comments for CVE-2026-54266

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