CVE-2026-117503

a2aproject a2a-go REST SSE handler rest.go resource consumption

CVSS score

6.9

EPSS probability

—

Risk score

0.7

Published

2 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.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

a2aproject a2a-go REST SSE Handler Resource Consumption Vulnerability (CVE-2026-117503)

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

A resource consumption vulnerability has been identified in the REST SSE handler of a2aproject a2a-go. Versions up to 2.4.0 are affected, and the attack can be initiated remotely. Upgrading to version 2.5.0 is recommended to address the issue.

Why does it matter?

This vulnerability allows remote attackers to cause resource consumption within the a2a-go component, leading to potential service disruptions. Organizations utilizing affected versions must apply the available patch promptly.

What should be done?

Upgrade the affected component to version 2.5.0 or later
Apply the patch reference ff6035bd21e44bb3ee1bfa547885b8c08327fa01
Follow the vendor advisory

Chain of evidence and sources2 verified claims

a2aproject a2a-go sürümleri 2.4.0 ve öncesi REST SSE işleyicisinde kaynak tüketimi zafiyetinden etkilenmektedir.

S0 · daybreach-canonical S1 · cvelist

Zafiyeti gidermek için sürüm 2.5.0 sürümüne yükseltme yapılması önerilir.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

A vulnerability was determined in a2aproject a2a-go up to 2.4.0. Impacted is an unknown function of the file a2asrv/rest.go of the component REST SSE handler. This manipulation causes resource consumption. It is possible to initiate the attack remotely. Upgrading to version 2.5.0 is recommended to address this issue. Patch name: ff6035bd21e44bb3ee1bfa547885b8c08327fa01. It is recommended to upgrade the affected component.

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X

CWE: CWE-400, CWE-404

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-2026-117503 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	a2aproject	a2a-go	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
6.9	CVSS V4_0	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X	CVE CNA
6.9	CVSS V40	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
5.3	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C	CVE CNA
5.3	CVSS V3_0	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C	CVE CNA
5.3	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	NVD
5.0	CVSS V2_0	—	AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C	CVE CNA
5.0	CVSS V2	—	AV:N/AC:L/Au:N/C:N/I:N/A:P	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-2026-117503 is associated with the following CWEs:

CWE-400: Common Weakness Enumeration Entry CWE-400 CWE-404: Common Weakness Enumeration Entry CWE-404

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-2026-117503 weaknesses.

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

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

VDB-427070 | a2aproject a2a-go REST SSE handler rest.go resource consumptionvendor-advisory VDB-427070 | CTI Indicators (IOB, IOC, TTP, IOA)vendor-advisory CVE-2026-117503 | CVE Analysis and Reportvendor-advisory Submit #1015052 | a2aproject a2a-go ≤ v2.4.0 CWE-400vendor-advisory https://github.com/a2aproject/a2a-go/pull/396patch https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01patch https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0patch https://github.com/a2aproject/a2a-go/vendor-advisory

CVSS Vector Radar Chart

6.9 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)Low

Yama doğrulandı

6 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

a2aproject

Weakness Type (CWE & CAPEC)

CWE-400 CWE-404

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Get this vulnerability through the API

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

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a2aproject a2a-go REST SSE handler rest.go resource consumption

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

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