Denial of Service in Spring WebFlux Multipart Request Processing
CVE-2026-41840 is a denial-of-service vulnerability in Spring Framework affecting Spring WebFlux applications that process multipart requests. The issue is described as a multipart parsing flaw in the WebFlux request-processing path whereby crafted malicious multipart requests can trigger memory leakage during request handling. This can progressively exhaust application memory and destabilize the host or application runtime. Affected versions are Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48; unsupported versions are also reported as affected.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Spring WebFlux multipart file parsing that can trigger memory leaks and destabilize the host.
A denial-of-service vulnerability in Spring Framework WebFlux where malicious multipart requests can cause memory leaks and potentially crash or degrade the application.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.