EUVD-2026-66853
GHSA-q49m-fm49-9mmx
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable, no auth required, no user interaction; impact is resource exhaustion (disk/storage), not integrity or confidentiality - A:H is the correct primary impact for CWE-770.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
Lifecycle Timeline
3DescriptionCVE.org
The PartEventHttpMessageReader in Spring WebFlux does not enforce the maxPartSize limit when maxInMemorySize is set to -1. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28
AnalysisAI
Spring WebFlux's PartEventHttpMessageReader fails to enforce the configured maxPartSize limit when maxInMemorySize is explicitly set to -1, allowing remote unauthenticated attackers to upload multipart request parts of arbitrary size in violation of application-defined policy. Affected are Spring Framework 6.1.0 through 6.1.28, 6.2.0 through 6.2.19, and 7.0.0 through 7.0.8. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two specific conditions both to be true: (1) the Spring WebFlux application must be configured with maxInMemorySize set to -1 on the PartEventHttpMessageReader or the reactive codec configuration - this is a non-default but operationally common tuning choice made to avoid buffering large uploads in heap memory; and (2) the application must expose an HTTP endpoint that accepts multipart/form-data request bodies (e.g., file upload, form submission with file attachment). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) presents a notable internal inconsistency worth flagging: the I:H (High Integrity) rating is atypical for a resource-limit bypass (CWE-770) and conflicts with the 'Information Disclosure' tag which implies confidentiality concern, yet C:N is set. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a patched release per the vendor advisory at https://spring.io/security/cve-2026-47885; exact patched versions are not independently confirmed in the available data beyond the stated affected ranges (6.1.0-6.1.28, 6.2.0-6.2.19, 7.0.0-7.0.8), so administrators should consult the Spring security page directly for the specific fixed version (expected to be 6.1.29+, 6.2.20+, or 7.0.9+). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all production applications using Spring Framework versions 6.1.0-6.1.28, 6.2.0-6.2.19, or 7.0.0-7.0.8 that handle multipart uploads. …
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External POC / Exploit Code
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