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MEDIUM severity

CVE-2026-41853 — spring-webmvc

MEDIUM

CVE-2026-41853 is a medium-severity (CVSS 5.3) CWE-444 vulnerability in org.springframework:spring-webmvc. A fix is available for org.springframework:spring-webmvc — see the affected versions and patch details below.

Spring Framework Multipart Request Smuggling in Spring MVC and WebFlux

Published
Updated
Affected
8 pkgs
Patched
4 / 8
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-41853.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk-0.12%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk
0.00%0.27%0.54%0.81%0.2%0.2%0.2%0.3%0.2%Jul 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-41853 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 398,142 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

8 pkgs affected
☕org.springframework:spring-webmvc☕org.springframework:spring-webflux☕org.springframework:spring-webmvc☕org.springframework:spring-webflux☕org.springframework:spring-webmvc☕org.springframework:spring-webflux☕org.springframework:spring-webmvc☕org.springframework:spring-webflux

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

8 total 4 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.springframework:spring-webmvc≥ 7.0.0&&< 7.0.87.0.8org.springframework:spring-webmvc:7.0.8
☕Mavenorg.springframework:spring-webflux≥ 7.0.0&&< 7.0.87.0.8org.springframework:spring-webflux:7.0.8
☕Mavenorg.springframework:spring-webmvc≥ 6.2.0&&< 6.2.196.2.19org.springframework:spring-webmvc:6.2.19
☕Mavenorg.springframework:spring-webflux≥ 6.2.0&&< 6.2.196.2.19org.springframework:spring-webflux:6.2.19
☕Mavenorg.springframework:spring-webmvc≥ 6.1.0No fix
☕Mavenorg.springframework:spring-webflux≥ 6.1.0No fix

Affected Products

1 product · 4 configurations
Application
spring frameworkvmware
≥ 7.0.0 && < 7.0.7.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.springframework:spring-webmvc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.springframework:spring-webmvc to 7.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-41853 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This Moderate-impact flaw in Spring MVC and WebFlux applications allows remote, unauthenticated attackers to conduct Multipart request smuggling. This can lead to bypassing security controls or modifying data, affecting the integrity of applications utilizing these Spring Framework components.

Workaround published by Red Hat
Users of affected versions should upgrade to the corresponding fixed version.
Source: Red Hat security advisory for CVE-2026-41853 (CC BY 4.0)

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2026-41853: spring-webmvc — Fixed in 7.0.8