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Fencer Intel
medium 5.3

CVE-2026-41853 json

Spring Framework Multipart Request Smuggling in Spring MVC and WebFlux

published 5mo ago modified last mo. also GHSA-cjpg-rgq5-fr37 , EUVD-2026-35342

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

Spring MVC and WebFlux applications are vulnerable to Multipart request smuggling attacks.

Affected versions: Spring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.

Patch / fix

  • maven org.springframework:spring-webmvc 6.2.19, 7.0.8
  • maven org.springframework:spring-webflux 6.2.19, 7.0.8
  • Spring Spring Framework 5.3.49, 6.1.28, 6.2.18.1, 7.0.7.1

Is CVE-2026-41853 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-41853 updated cvss 5.3

Spring Framework: Spring Framework: Request smuggling vulnerability in Spring MVC and WebFlux

  • Red Hat OpenShift Developer Tools and Services jenkins, spring-web 6.2.14, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9 Red Hat build of Apache Camel - HawtIO 4 spring-web 6.2.14 Red Hat build of Apache Camel 4 for Quarkus 3 spring-web 6.2.14 Red Hat Data Grid 8 spring-web 6.2.14 Red Hat Enterprise Linux 7 xbean, xbean-javadoc Red Hat Enterprise Linux 8 xbean, resteasy, xbean-javadoc, resteasy-javadoc
    +4 more products
    Red Hat Enterprise Linux 9 xbean, resteasy, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer Red Hat JBoss Enterprise Application Platform Expansion Pack spring-web 6.2.14 Red Hat OpenShift Dev Spaces spring-web 6.2.14, devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9 Red Hat Single Sign-On 7 spring-web 6.2.14
    affected: workaround, no fix available “Users of affected versions should upgrade to the corresponding fixed version.”

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
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.springframework:spring-webmvc
>=7.0.0, <7.0.8
>=6.2.0, <6.2.19
>=6.1.0, <=6.1.21
<=5.3.39
7.0.8
6.2.19
maven org.springframework:spring-webflux
>=7.0.0, <7.0.8
>=6.2.0, <6.2.19
>=6.1.0, <=6.1.21
<=5.3.39
7.0.8
6.2.19

Affected products

  • Spring Spring Framework

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
Technology feeds

References

Sources

Fencer Intel 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.