a2aproject a2a-go up to 2.4.0 REST SSE handler a2asrv/rest.go resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k1.67+

Summaryinfo

A vulnerability classified as problematic was found in a2aproject a2a-go up to 2.4.0. The affected element is an unknown function of the file a2asrv/rest.go of the component REST SSE handler. Such manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-117503. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in a2aproject a2a-go up to 2.4.0. Affected by this issue is an unknown function of the file a2asrv/rest.go of the component REST SSE handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-117503. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2.5.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ff6035bd21e44bb3ee1bfa547885b8c08327fa01 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: a2a-go 2.5.0
Patch: ff6035bd21e44bb3ee1bfa547885b8c08327fa01

Timelineinfo

10/27/2026 Advisory disclosed
10/27/2026 +0 days VulDB entry created
10/27/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 396
Status: Confirmed

CVE: CVE-2026-117503 (🔒)
GCVE (CVE): GCVE-0-2026-117503
GCVE (VulDB): GCVE-100-427070

Entryinfo

Created: 10/27/2026 09:52
Changes: 10/27/2026 09:52 (59)
Complete: 🔍
Submitter: colorfullbz
Cache ID: 216::103

Submitinfo

Accepted

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