{"id":"CVE-2026-115419","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-115419","generatedAt":"2026-10-28T01:12:11.001Z","title":"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.","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).","published":"2026-10-22T21:17:18.000Z","lastModified":"2026-10-23T17:17:17.000Z","status":"Awaiting Analysis","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","cvss":{"version":"4.0","score":8.6,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-488"],"affected":[],"epss":{"score":0.00426,"percentile":0.36603,"date":"2026-10-26","history":[{"date":"2026-10-23","score":0.0034,"percentile":0.26203}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T21:17:18.000Z","detail":{"score":"8.6","severity":"HIGH","publishedAt":"2026-10-22T21:17:17.790Z"},"summary":"New CVE, high severity (CVSS 8.6)."}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-146-aws/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://pypi.org/project/strands-agents/1.43.0/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-115419","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}