CVE-2026-117503 Details
Description
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.
A denial-of-service vulnerability has been identified in the a2aproject a2a-go library, specifically in versions prior to 2.5.0. The issue arises in the REST Server-Sent Events (SSE) handler, where an unbuffered channel can lead to a goroutine leak if a streaming operation panics after the client has disconnected. This vulnerability can be exploited remotely, causing unnecessary resource consumption on the server.
Users are advised to upgrade to version 2.5.0 or later, where this issue has been fixed. The latest version can be downloaded from the a2aproject a2a-go GitHub releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 27, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/a2aproject/a2a-go/ | [email protected] | ProductSource CodeVendor |
| https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01 | [email protected] | Source CodeVendor |
| https://github.com/a2aproject/a2a-go/pull/396 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-117503 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1015052 | [email protected] | Permission Required |
| https://vuldb.com/vuln/427070 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/427070/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| a2aproject a2a-go | <= 2.4.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 27, 2026 | New CVE Received | [email protected] |