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MEDIUM severity

CVE-2026-22740 — spring-webflux

MEDIUM

CVE-2026-22740 is a medium-severity (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in org.springframework:spring-webflux. A fix is available for org.springframework:spring-webflux — see the affected versions and patch details below.

Spring Framework DoS with Multipart Temp Files in WebFlux

Published
Updated
Affected
4 pkgs
Patched
2 / 4
Exploits
None indexed
Exploitation data as of Nov 7, 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-2026-22740.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs28th percentile — riskier than 28% of all scored CVEsHighest risk
0.00%0.28%0.56%0.84%0.0%0.3%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected
☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕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

A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K. Under some circumstances, temp files may remain not deleted after the request is fully processed. This allows an attacker to consume available disk space.

Older, unsupported versions are also affected.

Affected Packages

4 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.springframework:spring-webflux≥ 7.0.0&&< 7.0.77.0.7org.springframework:spring-webflux:7.0.7
☕Mavenorg.springframework:spring-webflux≥ 6.2.0&&< 6.2.186.2.18org.springframework:spring-webflux:6.2.18
☕Mavenorg.springframework:spring-webflux≥ 6.1.0No fix
☕Mavenorg.springframework:spring-webfluxall versionsNo fix

Affected Products

1 product · 4 configurations
Application
spring frameworkvmware
≥ 7.0.0 && < 7.0.7
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-webflux, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.springframework:spring-webflux to 7.0.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-22740 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K. Under some circumstances, temp files may remain not deleted after the request is fully processed. This allows an attacker to consume available disk space. Older, unsupported versions are also affected.
O3 Security · Impact-Aware SCA

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CVE-2026-22740: spring-webflux — Fixed in 7.0.7