Vulnerability · Published Oct 27, 2026 · Assigned by VulDB
CVE-2026-117503a2aproject a2a-go REST SSE handler rest.go resource consumption
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in a2a-go from a2aproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| a2aproject | a2a-go | 2.02.12.22.32.4.0 |
Weakness: CWE-400, CWE-404 · Vector: 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
References
- VDB-427070 | a2aproject a2a-go REST SSE handler rest.go resource consumption vdb-entry
- VDB-427070 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- CVE-2026-117503 | CVE Analysis and Report third-party-advisory
- Submit #1015052 | a2aproject a2a-go ≤ v2.4.0 CWE-400 third-party-advisory
- https://github.com/a2aproject/a2a-go/pull/396 issue-tracking, patch
- https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01 patch
- https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0 patch
- https://github.com/a2aproject/a2a-go/ product