CVE-2026-54266
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk1th percentile — higher than 1% of all known CVEs
Summary
The vulnerability in Angular affects the HttpTransferCache mechanism used during Server-Side Rendering (SSR). An attacker can exploit a weak 32-bit DJB2 hash to cause collisions, overwriting sensitive endpoint responses in the TransferState cache. The issue is fixed in versions 22.0.1, 21.2.17, and 20.3.25.
Risk Assessment
The risk involves the possibility of an attacker overwriting responses from sensitive endpoints (e.g., /api/user/profile), potentially leading to data leakage or content manipulation displayed to the user.
Recommendation
It is recommended to immediately update Angular to version 22.0.1, 21.2.17, or 20.3.25 depending on the branch in use. Additional measures such as query parameter validation should also be considered.
Original NVD description (English source)
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.