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Back to active CVEs
High · CVSS 8.6CVE-2026-115419

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

Answer in brief

CVE-2026-115419 records a High severity (CVSS 8.6) vulnerability in Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server. The current sources do not mark it as known exploited. The current feed maps AWS/strands-agents (generic), AWS/strands-agents/sdk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/strands-agents (generic), AWS/strands-agents/sdk (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
AWS/strands-agentsgeneric>=0 <1.43.01.43.0
AWS/strands-agents/sdkgeneric>=0 <1.5.01.5.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for AWS/strands-agents, AWS/strands-agents/sdk.
  2. 2Review the reported fix. Update AWS/strands-agents to 1.43.0; AWS/strands-agents/sdk to 1.5.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • Source referencepypi.org
  • Source referencenpmjs.com
Upstream source 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. To mitigate this issue, users should upgrade to strands-agents 1.43.0 (Python) or @strands-agents/sdk 1.5.0 (TypeScript).

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-488
Source
CVE List V5
Source checked
Oct 22, 2026
References
4 linked sources
Open source record