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alldata EUVDEUVD-2026-58657

| CVE-2026-19826 MEDIUM
Improper Input Validation (CWE-20)
2026-08-14 cna@vuldb.com GHSA-fq8p-5fjc-mw7x
Deserialization Java
5.5
CVSS 4.0 · Vendor: vuldb
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Severity by source

Vendor (vuldb) PRIMARY
5.5 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
9.8 CRITICAL

Network-accessible Hessian2 deserialization endpoint with no authentication; Java deserialization via Hessian2 in enterprise-adjacent classpath environments typically yields full RCE, warranting C/I/A:H regardless of the CNA's limited-impact scoring.

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

Primary rating from Vendor (vuldb).

CVSS VectorVendor: vuldb

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Aug 14, 2026 - 13:32 vuln.today

DescriptionCVE.org

A vulnerability was detected in alldatacenter alldata up to 0.6.8. This affects the function Hessian2Input.readObject of the file /serialize/impl/HessianSerializer.java of the component xxl-rpc Listener. The manipulation results in deserialization. The attack may be performed from remote. The exploit is now public and may be used. The project closed the issue report as "not planned" without any further explanation.

AnalysisAI

Unsafe Java deserialization in alldatacenter alldata up to version 0.6.8 exposes the xxl-rpc Listener to remote, unauthenticated exploitation via crafted Hessian2-serialized payloads. The Hessian2Input.readObject() function in HessianSerializer.java processes attacker-controlled input without class validation, enabling object deserialization attacks that can activate gadget chains present in the application's JVM classpath. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify network-exposed xxl-rpc listener port
Delivery
Craft malicious Hessian2-serialized object payload
Exploit
Transmit payload unauthenticated to listener endpoint
Execution
Trigger Hessian2Input.readObject() deserialization
Persist
Activate classpath gadget chain
Impact
Execute arbitrary code in alldata JVM process
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Vulnerability AssessmentAI

Exploitation The xxl-rpc Listener service must be network-accessible to the attacker; if the listener is bound to all network interfaces or exposed beyond a trusted internal perimeter, exploitation requires no authentication (CVSS 4.0 PR:N), no user interaction, and no special non-default configuration - the endpoint is vulnerable in its default operating state. … 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) establishes the worst-case attack surface: the endpoint is network-reachable, requires no authentication, no user interaction, and no special preconditions - a fully unauthenticated remote attack. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote, unauthenticated attacker identifies the xxl-rpc listener port exposed by an alldata service instance and sends a crafted Hessian2-serialized payload using the publicly available proof-of-concept. The Hessian2Input.readObject() function processes the payload without class validation, triggering deserialization of attacker-controlled objects and, where suitable gadget libraries exist in the classpath, activating a gadget chain that executes arbitrary code under the alldata process context.
Remediation No vendor-released patch exists; the project maintainers formally closed GitHub issue #832 as 'not planned' without explanation, making this an indefinitely unpatched vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-58657 vulnerability details – vuln.today
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