Service interruption via unbounded error-response cache
Published Mar 20, 2026 · Updated Mar 20, 2026
Resource exhaustion in Micronaut Core 4.7.0 through 4.10.16 allows remote attackers to crash applications through HTML error handling. DefaultHtmlErrorResponseBodyProvider stores rendered pages in an unbounded ConcurrentHashMap keyed by error content, so unique attacker-influenced exception messages remain on the heap. An application must expose HTML error responses and include attacker-controlled data in repeated exception messages; sustained requests then end in OutOfMemoryError and process interruption.
Summary
What happened
Resource exhaustion in Micronaut Core 4.7.0 through 4.10.16 allows remote attackers to crash applications through HTML error handling. DefaultHtmlErrorResponseBodyProvider stores rendered pages in an unbounded ConcurrentHashMap keyed by error content, so unique attacker-influenced exception messages remain on the heap. An application must expose HTML error responses and include attacker-controlled data in repeated exception messages; sustained requests then end in OutOfMemoryError and process interruption.
The record
- CVE
- CVE-2026-33012
- Published
- Mar 20, 2026
- Updated
- Mar 20, 2026
- Vendor
- Micronaut Foundation
- Product
- Micronaut Core
- Classifications
- CWE-770, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 20, 2026CVE publishedPublication date reported by the CVE source.
- Mar 20, 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=>= 4.7.0, < 4.10.17
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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