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msgpack-java CVE-2026-90473

| EUVDEUVD-2026-76849 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-09-12 disclosure@vulncheck.com GHSA-9vjp-f3jg-99pq
Java Integer Overflow
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:L/VA:N/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; integrity-only impact (field substitution, no data disclosure or crash) yields I:L/C:N/A:N.

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

2
Metadata Corrected
Sep 12, 2026 - 11:40 vuln.today
tag: Buffer Overflow removed
Analysis Generated
Sep 12, 2026 - 11:31 vuln.today

DescriptionCVE.org

msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.

AnalysisAI

Integer overflow in msgpack-java's MessageUnpacker.skipValue() allows unauthenticated remote attackers to inject attacker-controlled data into deserialized fields by supplying a MAP32 container with an element count at or above 0x40000000. When the parser multiplies this count by 2 to traverse key-value pairs, the 32-bit result wraps, causing the cursor to halt prematurely and subsequent field reads to draw from attacker-supplied bytes rather than legitimate data. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation The target application must deserialize attacker-supplied binary data using msgpack-java's MessageUnpacker. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N) reflects a remotely exploitable, low-complexity, unauthenticated vulnerability with limited - integrity-only - impact. … 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 patch has been identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-90473 vulnerability details – vuln.today
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