High 8.1Published Oct 22, 2026

CVE-2026-115419Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server

Updated under an hour ago (Oct 28, 2026, 10:40 AM ET)

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It affects AWS strands-agents and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.43%, higher than 37% of scored CVEs.

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Exploited in the last 30 days

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. To mitigate this issue, users should upgrade to strands-agents 1.43.0 (Python) or @strands-agents/sdk 1.5.0 (TypeScript).

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-488
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.43% (percentile 37)
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

AWS strands-agents aws:strands_agents (from the name)	before 1.43.0	CNA record
AWS strands-agents/sdk aws:strands_agents_sdk (from the name)	before 1.5.0	CNA record

References

References

https://pypi.org/project/strands-agents/1.43.0/	release-notes, patch
https://www.npmjs.com/package/@strands-agents/sdk/v/1.5.0	release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-146-aws/	vendor-advisory
https://github.com/strands-agents/harness-sdk/security/advisories/GHSA-4v6f-7vjh-6x4m	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.