Bug 2491421 (CVE-2026-54267)
| Summary: | CVE-2026-54267 @angular/core: Angular Client Hydration DOM Clobbering & Response-Cache Poisoning | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | amctagga, aoconnor, bniver, ewittman, flucifre, gmeno, gotiwari, gparvin, groman, janstey, jhorak, mbenjamin, mhackett, mvyas, nipatil, pantinor, rhaigner, rhel-process-autobot, rkubis, sostapov, vereddy, watson-tool-maintainers |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
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| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in the Angular framework's client-side hydration feature for Server-Side Rendered (SSR) applications. This vulnerability, known as DOM Clobbering, allows a remote attacker to inject malicious data into the application's internal data cache. By exploiting a predictable identifier used to recover application state, an attacker can trick Angular into processing their controlled content instead of the legitimate one. This can lead to poisoning the HTTP Transfer Cache, potentially resulting in Cross-Site Scripting (XSS), where attackers can execute unauthorized code in a user's browser, privilege escalation, or user interface hijacking.
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| Regression: | --- | Mount Type: | --- |
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| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
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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, to optimize client-side bootstrap in Server-Side Rendered (SSR) environments, Angular supports Hydration via provideClientHydration(). During SSR, Angular serializes the application's runtime state (such as cached HttpClient responses) and outputs it into the HTML stream as a <script> tag with a predictable identifier. During client bootstrap, Angular recovers this state by looking up the element via document.getElementById('ng-state') and parsing its text content. Because the DOM element lookup for the state container is predictable and relies solely on the ID selector (ng-state), it is susceptible to DOM Clobbering. If the application binds untrusted user input or CMS content to element properties such as id (e.g., <div [id]="userInput"> or <a id="ng-state">) before the genuine <script> tag is parsed by the browser, the attacker-controlled element takes precedence in the DOM lookup. During hydration, when Angular calls document.getElementById('ng-state'), the browser returns the attacker's clobbered element. Angular then attempts to parse the text content or attributes of this clobbered element as JSON. This vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.