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Fencer Vulns
medium 5.9

CVE-2026-41840 json

Spring Framework Denial of Service via Multipart Requests in WebFlux

published 2026-06-09 5 mo ago modified 2026-09-10 1 mo ago also GHSA-83f7-v6px-pp3h , EUVD-2026-35327

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

Spring WebFlux applications are vulnerable to Denial of Service (DoS) attacks when processing multipart requests. 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-webflux 6.2.19, 7.0.8
  • Spring Spring Framework 5.3.49, 6.1.28, 6.2.18.1, 7.0.7.1

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-2026-41840 updated cvss 5.9

Spring Framework: Spring WebFlux: Denial of Service via multipart request processing

  • Red Hat Fuse 7 spring-webflux
    affected: workaround, no fix available “No specific mitigation is available. Restrict access to multipart request endpoints where possible.”

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
5 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
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-401 Missing Release of Memory after Effective Lifetime
  • CWE-400 Uncontrolled Resource Consumption
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.