CVE-2026-117503

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

State: Published
Severity: 6.9 Medium
Published: Oct 27, 2026
Updated: Oct 27, 2026
Reserved: Oct 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 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	VulDB
3.1	5.3 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	VulDB
3.0	5.3 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	VulDB
2.0	5.0 Medium	AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C	VulDB

Weaknesses

CWE-400 Resource Consumption
CWE-404 Denial of Service

Affected Products

Product	Versions
a2a-goa2aproject	2.0Affected 2.1Affected 2.2Affected 2.3Affected 2.4.0Affected 2.5.0Not affected

References

VDB-427070 | a2aproject a2a-go REST SSE handler rest.go resource consumptionvdb-entry
VDB-427070 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2026-117503 | CVE Analysis and Reportthird-party-advisory
Submit #1015052 | a2aproject a2a-go ≤ v2.4.0 CWE-400third-party-advisory
https://github.com/a2aproject/a2a-go/pull/396issue-trackingpatch
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/product

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