CVE-2026-117503: a2aproject a2a-go REST SSE handler rest.go resource consumption
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
a2aproject/a2a-goto a version that resolves this vulnerability.Fixed in 2.5.0Patch ff6035bd21e44bb3ee1bfa547885b8c08327fa01
Event History
Frequently Asked Questions
Which deployments are affected?
a2aproject a2a-go versions up to and including 2.4.0 are affected, specifically involving the REST SSE handler in a2asrv/rest.go.
Can this be exploited remotely without authentication?
Yes. The supplied vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What is the impact of successful exploitation?
The reported impact is resource consumption, with availability impact rated low. No confidentiality or integrity impact is identified.
What remediation is available?
Upgrade a2aproject a2a-go to version 2.5.0. The identified patch is ff6035bd21e44bb3ee1bfa547885b8c08327fa01.