{"id":"CVE-2026-116479","kind":"vulnerability","aliases":["CVE-2026-116479"],"related":[],"title":"a2a-java: JSON-RPC error handler leaks information through error messages","description":"A flaw has been found in a2aproject a2a-java up to 1.2.0.Final. This impacts the function getMessage of the component JSON-RPC Error Handler. This manipulation causes information exposure through error message. The attack can be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. Patch name: bbee3369f3825d0fba2373d821f6dc6d4fc82ec0. Upgrading the affected component is advised.","summary":"The getMessage function in the JSON-RPC Error Handler of a2a-java up to 1.2.0.Final exposes information through error messages. A remote attacker can trigger the error path and read the leaked details.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["a2a","java","json-rpc","package"],"not_affected_if":["not-using-a2a-java","version-1.3.0-or-later"],"how_to_check":"- Check the a2a-java version in your build file (Maven `io.github.a2aproject:a2a-java` or equivalent) and confirm whether it is `1.2.0.Final` or earlier.\n- unknown for other checks; the sources do not say which request or input triggers the leak.","fix":"- Upgrade a2a-java to `1.3.0.Final` or later, per the upstream patch bbee3369f3825d0fba2373d821f6dc6d4fc82ec0.","status":"open","published_at":"2026-10-26T20:17:55+00:00","first_seen_at":"2026-10-26T20:50:17+00:00","triaged_at":"2026-10-26T20:51:51+00:00","updated_at":"2026-10-26T20:51:51+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-26T20:51:51Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade a2a-java to `1.3.0.Final` or later, per the upstream patch bbee3369f3825d0fba2373d821f6dc6d4fc82ec0.","reach":"internet","title":"a2a-java: JSON-RPC error handler leaks information through error messages","impact":"low","summary":"The getMessage function in the JSON-RPC Error Handler of a2a-java up to 1.2.0.Final exposes information through error messages. A remote attacker can trigger the error path and read the leaked details.","category":"package","nicknames":[],"who_cares":["java","a2a","json-rpc"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Internal error details readable by remote callers","analyst_note":"","how_to_check":"- Check the a2a-java version in your build file (Maven `io.github.a2aproject:a2a-java` or equivalent) and confirm whether it is `1.2.0.Final` or earlier.\n- unknown for other checks; the sources do not say which request or input triggers the leak.","needs_analyst":false,"not_affected_if":["not-using-a2a-java","version-1.3.0-or-later"],"who_is_affected":"Applications that embed a2a-java up to 1.2.0.Final and expose its JSON-RPC endpoint to remote callers are exposed. Services that do not use a2a-java, or that are on 1.3.0.Final or later, can skip it. The sources do not say which request types trigger the leak.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000609,"input_tokens":3363,"output_tokens":546,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116479':16A,19A '-2026':15A,18A '1.2.0.final':42B,73C '1.3.0.final':104C 'a2a':2A,20B,38B,69C 'a2a-java':1A,37B,68C 'a2aproject':67C 'advis':117C 'affect':114C 'attack':50B,96C 'bbee3369f3825d0fba2373d821f6dc6d4fc82ec0':111C 'caus':89C 'compon':81C,115C 'cve':14A,17A 'detail':60B 'error':7A,12A,34B,46B,54B,85C,93C 'expos':43B 'exposur':91C 'fix':106C 'flaw':62C 'found':65C 'function':28B,77C 'getmessag':27B,78C 'handler':8A,35B,86C 'impact':75C 'inform':10A,44B,90C 'initi':99C 'issu':108C 'java':3A,21B,39B,70C 'json':5A,23B,32B,83C 'json-rpc':4A,22B,31B,82C 'leak':9A,59B 'manipul':88C 'messag':13A,47B,94C 'name':110C 'packag':25B 'patch':109C 'path':55B 'read':57B 'remot':49B,100C 'rpc':6A,24B,33B,84C 'trigger':52B 'upgrad':101C,112C 'version':103C","nicknames":[],"mitigations":[],"who_affected":"Applications that embed a2a-java up to 1.2.0.Final and expose its JSON-RPC endpoint to remote callers are exposed. Services that do not use a2a-java, or that are on 1.3.0.Final or later, can skip it. The sources do not say which request types trigger the leak.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T20:17:55+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"cna@vuldb.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116479","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116479","severity":null,"published_at":"2026-10-26T20:17:55+00:00","modified_at":"2026-10-26T20:17:55+00:00","first_seen_at":"2026-10-26T20:50:17+00:00","fetched_at":"2026-10-26T20:50:17+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}