Service interruption via unbounded recursive deserialization
Published Sep 12, 2026 · Updated Sep 12, 2026
Stack overflow in MessagePack for Java 0.9.12 and earlier allows attackers to interrupt deserialization via deeply nested MessagePack arrays. MessageUnpacker.unpackValue() recursively processes every array element and map entry without enforcing a nesting-depth limit. The affected path must receive attacker-controlled MessagePack data, and exhaustion raises StackOverflowError in the deserializing thread, causing that request to fail.
Summary
What happened
Stack overflow in MessagePack for Java 0.9.12 and earlier allows attackers to interrupt deserialization via deeply nested MessagePack arrays. MessageUnpacker.unpackValue() recursively processes every array element and map entry without enforcing a nesting-depth limit. The affected path must receive attacker-controlled MessagePack data, and exhaustion raises StackOverflowError in the deserializing thread, causing that request to fail.
The record
- CVE
- CVE-2026-90472
- Published
- Sep 12, 2026
- Updated
- Sep 12, 2026
- Vendor
- MessagePack
- Product
- MessagePack for Java
- Classifications
- T1499
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 12, 2026CVE publishedPublication date reported by the CVE source.
- Sep 12, 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=0 <=0.9.12
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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