Multipart size-limit bypass via unlimited memory setting
Published Aug 27, 2026 · Updated Aug 27, 2026
Resource limit bypass in affected Spring Framework releases allows remote attackers to exceed configured multipart part-size limits. PartEventHttpMessageReader skips maxPartSize enforcement when maxInMemorySize is -1, so oversized request parts continue into the reactive event stream. Exposure requires a WebFlux controller with an @RequestBody Flux argument and the unlimited in-memory setting; published evidence establishes limit bypass but does not document a crash or data modification.
Summary
What happened
Resource limit bypass in affected Spring Framework releases allows remote attackers to exceed configured multipart part-size limits. PartEventHttpMessageReader skips maxPartSize enforcement when maxInMemorySize is -1, so oversized request parts continue into the reactive event stream. Exposure requires a WebFlux controller with an @RequestBody Flux argument and the unlimited in-memory setting; published evidence establishes limit bypass but does not document a crash or data modification.
The record
- CVE
- CVE-2026-47885
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- Spring
- Product
- Spring Framework
- Classifications
- CWE-770
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.1.0 <=6.1.28
- Affected versionversion=6.2.0 <=6.2.19
- Affected versionversion=7.0.0 <=7.0.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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