High [CVE-2026-47891] Denial of Service due to maxInMemorySize bypass
This high-severity Red Hat Linux advisory covers CVE-2026-47891.
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Summary
A Spring WebFlux application that relies on the Aalto XML processor to parse XML input does not correctly enforce the maxInMemorySize limit.
Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49 Spring Framework 5.2.25.RELEASE and earlier A remote attacker could exploit this vulnerability by sending specially crafted XML, causing the application to bypass the maxInMemorySize limit.
This can lead to excessive memory consumption, potentially resulting in a denial of service (DoS) condition for the application. CVE-2026-47891 affects Spring Framework's WebFlux module only when an application uses the reactive WebFlux stack together with the Aalto XML processor (com.fasterxml:aalto-xml) to parse XML request bodies.
Red Hat products ship spring-web/spring-webflux transitively as part of servlet-based (Spring MVC) or non-web integrations; none run the reactive WebFlux XML-decode path, and the Aalto XML processor is not shipped in any Red Hat product (verified across the portfolio).
The vulnerable code path is therefore never in execution, and these products are not affected. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770.
- 7.0.0
- 7.0.8
- 6.2.0
- 6.2.19
- 6.1.0
- 6.1.28
- 6.0.0
- 6.0.30
- 5.3.0
- 5.3.49
- 5.2.25
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Not applicable to Red Hat products (not affected). Applications that do use Spring WebFlux with the Aalto XML processor should upgrade to a fixed Spring Framework release (7.0.9, 6.2.20, 6.1.29, 6.0.31, 5.3.50, or 5.2.26).
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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