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msgpack-java EUVDEUVD-2026-76848

| CVE-2026-90472 MEDIUM
Uncontrolled Recursion (CWE-674)
2026-09-12 disclosure@vulncheck.com GHSA-h5hr-vppv-v9cg
Java Deserialization
6.9
CVSS 4.0 · Vendor: vulncheck
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Severity by source

Vendor (vulncheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-reachable with no auth or interaction required; availability impact is Low as only per-request failures occur, not full service crash.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck).

CVSS VectorVendor: vulncheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Sep 12, 2026 - 11:30 vuln.today

DescriptionCVE.org

msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.

AnalysisAI

Stack overflow denial-of-service in msgpack-java through 0.9.12 allows unauthenticated remote attackers to crash individual deserialization requests by sending crafted payloads containing deeply nested MessagePack arrays or maps. The root cause is unbounded recursion in MessageUnpacker.unpackValue() (lines 646-664), which processes nested structures without any depth limit, exhausting the JVM thread stack and throwing an unhandled StackOverflowError. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation The application must use msgpack-java ≤0.9.12 and must pass attacker-controlled binary data to `MessageUnpacker.unpackValue()` or a higher-level API that delegates to it. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L) reflects a network-reachable, zero-prerequisite DoS with limited availability impact - the `VA:L` metric correctly captures that only per-request failures occur rather than full service crashes, provided the application handles `StackOverflowError` at an appropriate boundary. … 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 No vendor-released patched version has been confirmed in the available data at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-76848 vulnerability details – vuln.today
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