EUVD-2026-80659
GHSA-27g5-xw56-jcm2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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
Network-reachable path resolver requires ability to drive the data model (PR:L); only inherited prototype/function references leak, so C:L with I:N/A:N.
Primary rating from Vendor (vuldb).
CVSS VectorVendor: vuldb
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability was identified in a2ui-project a2ui 0.8/0.9/1.0. Impacted is an unknown function of the file model-processor.ts of the component Model Processor. The manipulation of the argument current[segment] leads to information disclosure. The attack may be initiated remotely. The identifier of the patch is 1b3bff234661ce922cbc3771be642b23ec9fd0fa. To fix this issue, it is recommended to deploy a patch.
AnalysisAI
Information disclosure in the a2ui agent-to-UI rendering library (versions 0.8, 0.9, and 1.0) lets a caller that can drive an A2UI surface read JavaScript prototype-chain members - such as __proto__, constructor, toString, and valueOf - through the Model Processor's data-binding path resolver, leaking internal object structure rather than application data. The flaw is an unauthenticated-of-the-network-but-role-limited (CVSS PR:L) defect in model-processor.ts, where path segments are evaluated as current[segment] without an own-property check; impact is limited to low confidentiality loss with no integrity or availability effect, and there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to supply or influence a data-binding path that the a2ui Model Processor's getData resolver evaluates against the surface data model. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a low-to-moderate severity information disclosure flaw with a limited real-world risk profile. … 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 | Apply the upstream fix: deploy commit 1b3bff234661ce922cbc3771be642b23ec9fd0fa (pull request #2355, referenced from https://github.com/a2ui-project/a2ui/commit/1b3bff234661ce922cbc3771be642b23ec9fd0fa), which adds an own-property check to the Model Processor's getData() resolver so inherited Object.prototype members resolve to null. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today