{"id":"CVE-2026-117503","state":"PUBLISHED","title":"a2aproject a2a-go REST SSE handler rest.go resource consumption","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.","publishedAt":"2026-10-27T13:45:17.953Z","updatedAt":"2026-10-27T13:45:17.953Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulDB"},"assigner":"VulDB","products":["a2aproject a2a-go"],"affected":[{"vendor":"a2aproject","product":"a2a-go","versions":[{"version":"2.0","status":"affected"},{"version":"2.1","status":"affected"},{"version":"2.2","status":"affected"},{"version":"2.3","status":"affected"},{"version":"2.4.0","status":"affected"},{"version":"2.5.0","status":"unaffected"}],"cpes":["cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*"],"modules":["REST SSE handler"]}],"references":["https://vuldb.com/vuln/427070","https://vuldb.com/vuln/427070/cti","https://vuldb.com/cve/CVE-2026-117503","https://vuldb.com/submit/1015052","https://github.com/a2aproject/a2a-go/pull/396","https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01","https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0","https://github.com/a2aproject/a2a-go/"],"weaknesses":["CWE-400","CWE-404"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/117xxx/CVE-2026-117503.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-117503","state":"PUBLISHED","datePublished":"2026-10-27T13:45:17.953Z","dateUpdated":"2026-10-27T13:45:17.953Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-10-27T08:47:20.319Z"},"containers":{"cna":{"title":"a2aproject a2a-go REST SSE handler rest.go resource consumption","descriptions":[{"lang":"en","value":"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":[{"vendor":"a2aproject","product":"a2a-go","versions":[{"version":"2.0","status":"affected"},{"version":"2.1","status":"affected"},{"version":"2.2","status":"affected"},{"version":"2.3","status":"affected"},{"version":"2.4.0","status":"affected"},{"version":"2.5.0","status":"unaffected"}],"cpes":["cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*"],"modules":["REST SSE handler"]}],"references":[{"url":"https://vuldb.com/vuln/427070","name":"VDB-427070 | a2aproject a2a-go REST SSE handler rest.go resource consumption","tags":["vdb-entry"]},{"url":"https://vuldb.com/vuln/427070/cti","name":"VDB-427070 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-117503","name":"CVE-2026-117503 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/1015052","name":"Submit #1015052 | a2aproject a2a-go ≤ v2.4.0 CWE-400","tags":["third-party-advisory"]},{"url":"https://github.com/a2aproject/a2a-go/pull/396","tags":["issue-tracking","patch"]},{"url":"https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01","tags":["patch"]},{"url":"https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0","tags":["patch"]},{"url":"https://github.com/a2aproject/a2a-go/","tags":["product"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":6.9,"vectorString":"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","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":5.3,"vectorString":"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","baseSeverity":"MEDIUM"}},{"cvssV3_0":{"version":"3.0","baseScore":5.3,"vectorString":"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","baseSeverity":"MEDIUM"}},{"cvssV2_0":{"version":"2.0","baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","type":"CWE","lang":"en","description":"Resource Consumption"}]},{"descriptions":[{"cweId":"CWE-404","type":"CWE","lang":"en","description":"Denial of Service"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-10-27T13:45:17.953Z"},"timeline":[{"time":"2026-10-27T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-10-27T01:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-10-27T09:52:42.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"colorfullbz (VulDB User)","type":"reporter"}],"tags":["x_open-source"],"x_generator":["VulDB PVTS v202610"]}}}}