CVE-2026-116477

a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure

CVSS score

5.3

EPSS probability

—

Risk score

0.5

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-116477: a2aproject a2a-dotnet Information Exposure Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-116477 is a security vulnerability in the a2aproject a2a-dotnet component that leads to information exposure through error messages and can be exploited remotely.

Why does it matter?

This vulnerability allows attackers to access system information through error messages. Upgrading the affected component resolves this risk.

What should be done?

Upgrade a2a-dotnet to version 1.0.0-preview3
Apply patch identifier ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4

Chain of evidence and sources2 verified claims

CVE-2026-116477 zafiyeti, a2a-dotnet 1.0.0-preview2 ve önceki sürümlerde bilgi ifşasına neden olur.

S0 · daybreach-canonical S1 · cvelist

Sorun 1.0.0-preview3 sürümüne yükseltilerek çözülebilir.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

A security vulnerability has been detected in a2aproject a2a-dotnet up to 1.0.0-preview2. The impacted element is the function A2AJsonRpcProcessor.ProcessRequestAsync of the file src/A2A.AspNetCore/A2AJsonRpcProcessor.cs of the component Parser. The manipulation leads to information exposure through error message. It is possible to initiate the attack remotely. Upgrading to version 1.0.0-preview3 is sufficient to resolve this issue. The identifier of the patch is ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4. Upgrading the affected component is recommended.

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

CWE: CWE-209, CWE-200

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-116477 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	a2aproject	a2a-dotnet	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
5.3	CVSS V4_0	MEDIUM	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	CVE CNA
5.3	CVSS V40	MEDIUM	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
4.3	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C	CVE CNA
4.3	CVSS V3_0	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C	CVE CNA
4.3	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	NVD
4.0	CVSS V2_0	—	AV:N/AC:L/Au:S/C:P/I:N/A:N/E:ND/RL:OF/RC:C	CVE CNA
4.0	CVSS V2	—	AV:N/AC:L/Au:S/C:P/I:N/A:N	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

6 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

CNA çözüm referansı

Open source

cvelist

CNA çözüm referansı

Open source

cvelist

CNA çözüm referansı

Open source

reference

Yama veya çözüm referansı

Open source

reference

Yama veya çözüm referansı

Open source

reference

Yama veya çözüm referansı

Open source

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-116477 is associated with the following CWEs:

CWE-209: Common Weakness Enumeration Entry CWE-209 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-116477 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsLow

UserGerekmiyor

Official Sources and Advisories

VDB-426390 | a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposurevendor-advisory VDB-426390 | CTI Indicators (IOB, IOC, TTP, IOA)vendor-advisory CVE-2026-116477 | CVE Analysis and Reportvendor-advisory Submit #1014890 | a2aproject a2a-dotnet ≤ v1.0.0-preview2 CWE-209vendor-advisory https://github.com/a2aproject/a2a-dotnet/pull/452patch https://github.com/a2aproject/a2a-dotnet/commit/ccbd12b6108a6a8f0fd5d8b4a9ece3c8a94ba1e4patch https://github.com/a2aproject/a2a-dotnet/releases/tag/v1.0.0-preview3patch https://github.com/a2aproject/a2a-dotnet/vendor-advisory

CVSS Vector Radar Chart

5.3 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow privileges

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)None

Yama doğrulandı

6 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

a2aproject

Weakness Type (CWE & CAPEC)

CWE-209 CWE-200

Similar Vulnerabilities

6.9

CVE-2026-116478a2aproject a2a-go Push Notification agentexec.go CreateExecutor information exposure

Vendora2aproject Producta2a-go

Patch verified3 h ago

5.3

CVE-2026-116479a2aproject a2a-java JSON-RPC Error getMessage information exposure

Vendora2aproject Producta2a-java

Patch verified2 h ago

5.3

CVE-2026-116476a2aproject a2a-dotnet TaskProjection TaskProjection.ApplyStatus race condition

Vendora2aproject Producta2a-dotnet

Patch verified3 h ago

7.5

CVE-2026-111765A2A Java SDK: Android synchronous POST forwards credentials across authorities after incomplete redirect fix

Vendora2aproject Producta2a-java+2 etkilenen

Patch status unknownEPSS %16 d ago

6.9

CVE-2026-90819a2aproject a2a-java Authorization Header Construction BasePushNotificationSender.java BasePushNotificationSender.dispatchNotification response splitting

Vendora2aproject Producta2a-java

Patch verifiedEPSS %11 mo ago

7.5

CVE-2026-111764A2A Java SDK has a fail-open default task authorization

Vendora2aproject Producta2a-java+2 etkilenen

Patch status unknownEPSS %16 d ago

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

Get a free key Documentation

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-116477"

a2aproject a2a-dotnet Parser A2AJsonRpcProcessor.cs A2AJsonRpcProcessor.ProcessRequestAsync information exposure

Impact on My Inventory

Vulnerability description

DayBreach AI Explanation

Short explanation

What should be done?

IMPACT: Affected Products and Software

Affected Products

RED HAT CSAF/VEX: Product Impact Check

SCORING: CVSS from Multiple Sources

CVSS Scores

Patch and Remediation Guide

Solution & Remediation Advisory

Public exploit and active exploitation status

Verified exploit intelligence

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

Common Attack Pattern Enumeration and Classification (CAPEC)

Attack Vector and Accessibility

Official Sources and Advisories

CVSS Vector Radar Chart

Vulnerability Scoring Details

Weakness Type (CWE & CAPEC)

Similar Vulnerabilities

Get this vulnerability through the API

DayBreach

Glossary & Reference

Directories & Feeds

RSS & Integration