{"id":"CVE-2026-117507","kind":"vulnerability","aliases":["CVE-2026-117507"],"related":[],"title":"a2a-java: race condition in TaskManager.saveTaskEvent up to 1.2.0.Final","description":"A security vulnerability has been detected in a2aproject a2a-java up to 1.2.0.Final. This impacts the function TaskManager.saveTaskEvent. The manipulation leads to race condition. The attack may be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. The identifier of the patch is 6b8e1e085c35e970ef0048901cd25850e4791ec2. The affected component should be upgraded.","summary":"The a2a-java library (the Java implementation of the Agent2Agent protocol) has a race condition in TaskManager.saveTaskEvent, the function that stores task events. The sources say an attacker can trigger it remotely, but they do not say what the attacker gains beyond the race itself.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["a2a-java","agent-to-agent","java","package"],"not_affected_if":["not-using-a2a-java","version-1.3.0-or-later"],"how_to_check":"- Check the a2a-java version in the project's build file (pom.xml or build.gradle) and confirm whether it is `1.2.0.Final` or earlier.\n- Search dependencies for `TaskManager` from `io.github.a2asdk` or `a2aproject` packages to confirm the library is in use.","fix":"- Upgrade a2a-java to `1.3.0.Final` or later (patch identifier 6b8e1e085c35e970ef0048901cd25850e4791ec2).","status":"open","published_at":"2026-10-27T15:16:57+00:00","first_seen_at":"2026-10-27T15:32:58+00:00","triaged_at":"2026-10-27T15:33:28+00:00","updated_at":"2026-10-27T15:33:28+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-27T15:33:28Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade a2a-java to `1.3.0.Final` or later (patch identifier 6b8e1e085c35e970ef0048901cd25850e4791ec2).","reach":"internet","title":"a2a-java: race condition in TaskManager.saveTaskEvent up to 1.2.0.Final","impact":"low","summary":"The a2a-java library (the Java implementation of the Agent2Agent protocol) has a race condition in TaskManager.saveTaskEvent, the function that stores task events. The sources say an attacker can trigger it remotely, but they do not say what the attacker gains beyond the race itself.","category":"package","nicknames":[],"who_cares":["java","a2a-java","agent-to-agent"],"confidence":0.5,"needs_auth":"unknown","worst_case":"unknown impact beyond a race condition in task event storage","analyst_note":"Find the upstream fix commit 6b8e1e085c35e970ef0048901cd25850e4791ec2 in a2aproject/a2a-java to learn what the race corrupts and whether it needs auth.","how_to_check":"- Check the a2a-java version in the project's build file (pom.xml or build.gradle) and confirm whether it is `1.2.0.Final` or earlier.\n- Search dependencies for `TaskManager` from `io.github.a2asdk` or `a2aproject` packages to confirm the library is in use.","needs_analyst":true,"not_affected_if":["not-using-a2a-java","version-1.3.0-or-later"],"who_is_affected":"Teams that run a Java service built on a2a-java up to 1.2.0.Final and expose its task handling to remote callers are affected. Projects that do not use a2a-java, or that run a newer version, can skip this.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000657,"input_tokens":3363,"output_tokens":641,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-117507':13A,16A '-2026':12A,15A '1.2.0.final':10A,84C '1.3.0.final':105C '6b8e1e085c35e970ef0048901cd25850e4791ec2':116C 'a2a':2A,18B,28B,80C 'a2a-java':1A,17B,27B,79C 'a2aproject':78C 'affect':118C 'agent':21B,23B 'agent-to-ag':20B 'agent2agent':36B 'attack':54B,66B,97C 'beyond':68B 'compon':119C 'condit':5A,41B,95C 'cve':11A,14A 'detect':76C 'event':49B 'fix':107C 'function':45B,88C 'gain':67B 'identifi':111C 'impact':86C 'implement':33B 'initi':100C 'issu':109C 'java':3A,19B,24B,29B,32B,81C 'lead':92C 'librari':30B 'manipul':91C 'may':98C 'packag':25B 'patch':114C 'protocol':37B 'race':4A,40B,70B,94C 'remot':58B,101C 'say':52B,63B 'secur':72C 'sourc':51B 'store':47B 'task':48B 'taskmanager.savetaskevent':7A,43B,89C 'trigger':56B 'upgrad':102C,122C 'version':104C 'vulner':73C","nicknames":[],"mitigations":[],"who_affected":"Teams that run a Java service built on a2a-java up to 1.2.0.Final and expose its task handling to remote callers are affected. Projects that do not use a2a-java, or that run a newer version, can skip this.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T15:16:57+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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-2026-117507","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117507","severity":null,"published_at":"2026-10-27T15:16:57+00:00","modified_at":"2026-10-27T15:16:57+00:00","first_seen_at":"2026-10-27T15:32:58+00:00","fetched_at":"2026-10-27T15:32:58+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"}