{"id":"CVE-2026-115419","aliases":[],"cve":{"records":[{"id":"CVE-2026-115419","source":"AMZN","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-22T13:19:51.802Z","published":"2026-10-22T20:04:04.191Z","modified":"2026-10-30T19:30:50.901Z"}],"publishers":[{"name":"AMZN","role":"CNA","organizationId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","modified":"2026-10-22T20:04:04.191Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-30T19:30:50.901Z"}],"references":[{"url":"https://pypi.org/project/strands-agents/1.43.0/","tags":["release-notes","patch"],"source":"AMZN"},{"url":"https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0","tags":["release-notes","patch"],"source":"AMZN"},{"url":"https://aws.amazon.com/security/security-bulletins/2026-146-aws/","tags":["vendor-advisory"],"source":"AMZN"},{"url":"https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m","tags":["third-party-advisory"],"source":"AMZN"}],"weaknesses":[{"id":"CWE-488","description":"CWE-488 Exposure of data element to wrong session","source":"AMZN"}],"applicability":[{"source":"AMZN","statements":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:aws:strands-agents:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"1.43.0"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:aws:strands-agents_sdk:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"1.5.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-30T19:30:41.939918Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server","titleSource":"AMZN","descriptionSource":"AMZN","description":"The A2A server component in Amazon Strands Agents SDK for Python before 1.43.0 and Amazon Strands Agents SDK for TypeScript before 1.5.0 does not properly isolate conversation state between callers. An authenticated remote user could read other tenants' conversation history and add persistent instructions that alter model behavior for subsequent callers via HTTP requests to the A2A endpoint using a different context_id.\n\n\n\nTo mitigate this issue, users should upgrade to strands-agents 1.43.0 (Python) or @strands-agents/sdk 1.5.0 (TypeScript).","score":8.6,"severity":"high","published":"2026-10-22T20:04:04.191Z","modified":"2026-10-30T19:30:50.901Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"AWS","name":"strands-agents","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"1.43.0","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"AMZN","url":"https://www.cve.org/CVERecord?id=CVE-2026-115419"},{"vendor":"AWS","name":"strands-agents/sdk","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"1.5.0","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"AMZN","url":"https://www.cve.org/CVERecord?id=CVE-2026-115419"}],"remediation":[],"references":["https://pypi.org/project/strands-agents/1.43.0/","https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0","https://aws.amazon.com/security/security-bulletins/2026-146-aws/","https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m"],"sources":[{"name":"CVE","id":"CVE-2026-115419","modified":"2026-10-30T19:30:50.901Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-115419"}],"assessments":[{"source":"AMZN","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},{"source":"AMZN","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.6}],"sourceAffected":[],"observedAt":"2026-10-30T20:45:56.858Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:20:35.359Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"The Amazon Strands Agents SDK A2A Server has a vulnerability where an authenticated remote user could read other tenants' conversation history and alter model behavior. This affects versions before 1.43.0 for Python and 1.5.0 for TypeScript. An attacker needs access to the A2A endpoint via HTTP requests.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-31T05:26:03.641Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-115419"}]}}