CVE-2026-47891: A Spring WebFlux application that relies on the Aalto XML processor to parse XML input does not correctly enfo

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-47891 is a critical-severity flaw (CVSS 9.8) affecting spring framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-08-27
Last modified	2026-09-02

Publisher (CNA): VMware · Vendor: vmware

Last updated 2026-09-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-27 06:17 UTCPublished CVE record published
2026-09-02 17:36 UTCUpdated Record last modified

vmware spring framework UPGRADE

Affected: < 5.2.26 · >= 5.3.0 and < 5.3.50 · >= 6.0.0 and < 6.0.31 · >= 6.1.0 and < 6.1.29 · >= 6.2.0 and < 6.2.20 · >= 7.0.0 and < 7.0.8.1

Fixed in: 5.2.26, 5.3.50, 6.0.31, 6.1.29, 6.2.20, 7.0.8.1

Safe to downgrade to: a release before 5.3.0

1. Check installed version

apt-cache policy spring-framework || rpm -q spring-framework || spring-framework --version

2. UPGRADE to 5.2.26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-framework

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-framework

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.3.0 (Debian / Ubuntu)

apt-cache madison spring-framework sudo apt install spring-framework=<VERSION_BEFORE_5.3.0> sudo apt-mark hold spring-framework

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list spring-framework sudo dnf downgrade spring-framework-<VERSION_BEFORE_5.3.0> sudo dnf versionlock add spring-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Spring Security Advisories: cve-2026-47891 - MEDIUM - Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder 2026-08-20

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47891?

spring framework: upgrade to 5.2.26, 5.3.50, 6.0.31, 6.1.29, 6.2.20, 7.0.8.1. Exact commands for each OS are on this page.

Is CVE-2026-47891 being exploited?

CVE-2026-47891 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47891 affect?

CVE-2026-47891 affects spring framework. Severity is critical (CVSS 9.8). 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 Spri

How urgent is CVE-2026-47891?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Spring Framework vulnerabilities · VMware vulnerabilities

Related CVEs

CVE-2026-22740 MEDIUM 6.5 UPGRADE A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K
CVE-2026-22745 MEDIUM 5.3 UPGRADE Spring MVC and WebFlux applications are vulnerable to Denial of Service attacks when resolving static resource
CVE-2026-22741 LOW 3.1 UPGRADE Spring MVC and WebFlux applications are vulnerable to cache poisoning when resolving static resources. More
CVE-2026-47883 MEDIUM 6.1 UPGRADE UrlHandlerFilter can be vulnerable to an open redirect when configured with very broadly matching patterns
CVE-2026-47889 HIGH 7.5 UPGRADE A WebFlux application running on the Jetty 12 Core reactive adapter serializes response cookies without the sa

References

← Back to latest CVEs