Medium severity · published Oct 27, 2026
CVE-2026-117503
a2aproject a2a-go REST SSE handler rest.go resource consumption
New
5.3
CVSS
0.7%
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?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
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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