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Fencer Vulns
critical 9.8

CVE-2026-47891 in the critical feed json

Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder

published 2026-08-27 2 mo ago modified 2026-09-02 2 mo ago also EUVD-2026-66859

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

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

Patch / fix

  • vmware spring_framework 5.2.26, 5.3.50, 6.0.31, 6.1.29, 6.2.20, 7.0.8.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-47891 updated cvss 7.5

org.springframework/spring-webflux: org.springframework/spring-web: Spring WebFlux: Denial of Service due to maxInMemorySize bypass

  • Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins 2.516.3.1758206866-3.el9 Red Hat build of Apache Camel 4 for Quarkus 3 spring-web 6.2.19 Red Hat Enterprise Linux 7 xbean-javadoc, xbean 3.13-6.el7 Red Hat Enterprise Linux 8 xbean, resteasy, xbean-javadoc, resteasy-javadoc Red Hat Enterprise Linux 9 resteasy, xbean 3.13-6.el7, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer Red Hat Fuse 7 spring-web 6.2.19, spring-webflux 5.2.13.RELEASE
    +2 more products
    Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9 Red Hat Single Sign-On 7 spring-web 6.2.19
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Spring Spring Framework

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.