{"id":"CVE-2026-117505","kind":"vulnerability","aliases":["CVE-2026-117505"],"related":[],"title":"a2a-java: queue offer flaw lets remote callers exhaust resources","description":"A security flaw has been discovered in a2aproject a2a-java up to 1.2.0.Final. The impacted element is the function queue.offer of the component ChildQueue. Performing a manipulation results in resource consumption. The attack can be initiated remotely. Upgrading to version 1.3.0.Final is sufficient to resolve this issue. The patch is named be663f806efcfdddd2805d214fae4998379ac5f2. It is advisable to upgrade the affected component.","summary":"a2a-java, the Java SDK for the Agent2Agent protocol, has a flaw in the ChildQueue offer function that a remote caller can trigger by manipulating input. An attacker can drive resource consumption on the affected service, which can degrade or deny availability.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["a2a","agents","java","package"],"not_affected_if":["internal-only","not-using-a2a-java"],"how_to_check":"- Check the a2a-java version in the project's build file (for example pom.xml or build.gradle) and confirm whether it is `1.2.0.Final` or earlier.\n- Confirm whether the service exposes the A2A endpoint to remote callers.","fix":"- Upgrade a2a-java to `1.3.0.Final` or later, which the advisory says resolves the issue (patch commit be663f806efcfdddd2805d214fae4998379ac5f2).","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":0.6,"triage":{"at":"2026-10-27T15:33:28Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade a2a-java to `1.3.0.Final` or later, which the advisory says resolves the issue (patch commit be663f806efcfdddd2805d214fae4998379ac5f2).","reach":"internet","title":"a2a-java: queue offer flaw lets remote callers exhaust resources","impact":"low","summary":"a2a-java, the Java SDK for the Agent2Agent protocol, has a flaw in the ChildQueue offer function that a remote caller can trigger by manipulating input. An attacker can drive resource consumption on the affected service, which can degrade or deny availability.","category":"package","nicknames":[],"who_cares":["java","a2a","agents"],"confidence":0.6,"needs_auth":"unknown","worst_case":"remote caller causes resource exhaustion, degrading service availability","analyst_note":"","how_to_check":"- Check the a2a-java version in the project's build file (for example pom.xml or build.gradle) and confirm whether it is `1.2.0.Final` or earlier.\n- Confirm whether the service exposes the A2A endpoint to remote callers.","needs_analyst":false,"not_affected_if":["not-using-a2a-java","internal-only"],"who_is_affected":"Teams running a2a-java `1.2.0.Final` or earlier in a service that accepts remote A2A requests are exposed, because the flaw can be triggered remotely. Projects that do not use a2a-java, or that run it only internally with no remote access, are less exposed. The sources do not say which request paths reach the vulnerable ChildQueue code.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000626,"input_tokens":3370,"output_tokens":578,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-117505':14A,17A '-2026':13A,16A '1.2.0.final':78C '1.3.0.final':106C 'a2a':2A,18B,23B,74C 'a2a-java':1A,22B,73C 'a2aproject':72C 'advis':120C 'affect':57B,124C 'agent':19B 'agent2agent':30B 'attack':50B,98C 'avail':64B 'be663f806efcfdddd2805d214fae4998379ac5f2':117C 'caller':9A,43B 'childqueu':37B,89C 'compon':88C,125C 'consumpt':54B,96C 'cve':12A,15A 'degrad':61B 'deni':63B 'discov':70C 'drive':52B 'element':81C 'exhaust':10A 'flaw':6A,34B,67C 'function':39B,84C 'impact':80C 'initi':101C 'input':48B 'issu':112C 'java':3A,20B,24B,26B,75C 'let':7A 'manipul':47B,92C 'name':116C 'offer':5A,38B 'packag':21B 'patch':114C 'perform':90C 'protocol':31B 'queue':4A 'queue.offer':85C 'remot':8A,42B,102C 'resolv':110C 'resourc':11A,53B,95C 'result':93C 'sdk':27B 'secur':66C 'servic':58B 'suffici':108C 'trigger':45B 'upgrad':103C,122C 'version':105C","nicknames":[],"mitigations":[],"who_affected":"Teams running a2a-java `1.2.0.Final` or earlier in a service that accepts remote A2A requests are exposed, because the flaw can be triggered remotely. Projects that do not use a2a-java, or that run it only internally with no remote access, are less exposed. The sources do not say which request paths reach the vulnerable ChildQueue code.","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:N/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-2026-117505","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117505","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"}