{"id":"CVE-2026-118271","kind":"vulnerability","aliases":["CVE-2026-118271"],"related":[],"title":"a2ui: data-context resolver flaw lets remote requests exhaust resources","description":"A security vulnerability has been detected in a2ui-project a2ui up to 0.10.6. This impacts an unknown function of the file renderers/web_core/src/v0_9/rendering/data-context.ts of the component data-context Resolver. Such manipulation leads to resource consumption. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The name of the patch is eb314e14fabd29cfb4a74e1202afc4fe2081efa2. Applying a patch is advised to resolve this issue.","summary":"The a2ui web renderer's data-context resolver, in renderers/web_core/src/v0_9/rendering/data-context.ts, mishandles certain input. A remote attacker can make it consume excessive resources, and a public exploit has been disclosed.","severity":"medium","cvss":4.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["a2ui","package","typescript","web-renderer"],"not_affected_if":["patched-version"],"how_to_check":"- Check whether the installed a2ui version is `0.10.6` or lower.\n- Look for `renderers/web_core/src/v0_9/rendering/data-context.ts` in the deployed code and compare it with the patched commit.","fix":"- Move to a2ui code that includes commit `eb314e14fabd29cfb4a74e1202afc4fe2081efa2`; the sources do not give a fixed release version, so the version is unknown.","status":"open","published_at":"2026-10-28T02:17:07+00:00","first_seen_at":"2026-10-28T02:30:29+00:00","triaged_at":"2026-10-28T02:32:08+00:00","updated_at":"2026-10-28T02:32:08+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-28T02:32:08Z","model":"claude-haiku-5-5","output":{"fix":"- Move to a2ui code that includes commit `eb314e14fabd29cfb4a74e1202afc4fe2081efa2`; the sources do not give a fixed release version, so the version is unknown.","reach":"internet","title":"a2ui: data-context resolver flaw lets remote requests exhaust resources","impact":"low","summary":"The a2ui web renderer's data-context resolver, in renderers/web_core/src/v0_9/rendering/data-context.ts, mishandles certain input. A remote attacker can make it consume excessive resources, and a public exploit has been disclosed.","category":"package","nicknames":[],"who_cares":["a2ui","web-renderer","typescript"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Remote requests exhaust resources; service slows or crashes","analyst_note":"","how_to_check":"- Check whether the installed a2ui version is `0.10.6` or lower.\n- Look for `renderers/web_core/src/v0_9/rendering/data-context.ts` in the deployed code and compare it with the patched commit.","needs_analyst":false,"not_affected_if":["patched-version"],"who_is_affected":"Teams running a2ui up to `0.10.6` that use the web_core renderer and its v0_9 data-context resolver are exposed. The sources do not say which deployment setups or data paths reach the vulnerable resolver, so the exact exposure is unknown.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.001128,"input_tokens":3386,"output_tokens":1578,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-118271':14A,17A '-2026':13A,16A '0.10.6':67C 'a2ui':1A,18B,25B,62C,64C 'a2ui-project':61C 'advis':118C 'appli':114C 'attack':40B,91C 'certain':36B 'compon':79C 'consum':44B 'consumpt':89C 'context':4A,31B,82C 'cve':12A,15A 'data':3A,30B,81C 'data-context':2A,29B,80C 'detect':59C 'disclos':53B,101C 'eb314e14fabd29cfb4a74e1202afc4fe2081efa2':113C 'excess':45B 'exhaust':10A 'exploit':50B,98C 'file':75C 'flaw':6A 'function':72C 'impact':69C 'input':37B 'issu':122C 'lead':86C 'let':7A 'make':42B 'manipul':85C 'may':92C,104C 'mishandl':35B 'name':108C 'packag':19B 'patch':111C,116C 'perform':94C 'project':63C 'public':49B,102C 'remot':8A,39B,96C 'render':23B,27B 'renderers/web_core/src/v0_9/rendering/data-context.ts':34B,76C 'request':9A 'resolv':5A,32B,83C,120C 'resourc':11A,46B,88C 'secur':55C 'typescript':20B 'unknown':71C 'use':106C 'vulner':56C 'web':22B,26B 'web-render':21B","nicknames":[],"mitigations":[],"who_affected":"Teams running a2ui up to `0.10.6` that use the web_core renderer and its v0_9 data-context resolver are exposed. The sources do not say which deployment setups or data paths reach the vulnerable resolver, so the exact exposure is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T02:17:07+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:P/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-2026-118271","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118271","severity":null,"published_at":"2026-10-28T02:17:07+00:00","modified_at":"2026-10-28T02:17:07+00:00","first_seen_at":"2026-10-28T02:30:29+00:00","fetched_at":"2026-10-28T02:30:29+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"}