CVE-2026-116477

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.31% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 24.2% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-27.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-26 19:15Z2 DAYS AGO

Last updated

2026-10-26 19:15Z2 DAYS AGO

Reserved

2026-10-26

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
• CWE-209Generation of Error Message Containing Sensitive InformationBase

Data version

5.2

Document digest

0f03a588e55da2ea71a61b1d98154649403d947913bd7d5d264600833f1da7c5

• vuldb.comVDB-426390 | a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposurehttps://vuldb.com/vuln/426390vdb-entrytechnical-description
• vuldb.comVDB-426390 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/426390/ctisignaturepermissions-required
• vuldb.comCVE-2026-116477 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-116477third-party-advisory
• vuldb.comSubmit #1014890 | a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209https://vuldb.com/submit/1014890third-party-advisory
• github.comhttps://github.com/a2aproject/a2a-dotnet/pull/452issue-trackingpatch
• github.comhttps://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4patch
• github.comhttps://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3patch
• github.comhttps://github.com/a2aproject/a2a-dotnet/product