Medium severity · published Oct 27, 2026
CVE-2026-117503
a2aproject a2a-go REST SSE handler rest.go resource consumption
New
5.3
CVSS
–
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A2
a2a-go · a2aproject
2.0; 2.1; 2.2; 2.3; 2.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-117503
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-117503
github.com
https://github.com/a2aproject/a2a-go/
github.com
https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01
github.com
https://github.com/a2aproject/a2a-go/pull/396
github.com
https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0
vuldb.com
https://vuldb.com/cve/CVE-2026-117503
vuldb.com
https://vuldb.com/submit/1015052
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