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CVE-2026-115419

Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server

Products / packages AWS strands-agents · AWS strands-agents/sdk

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 00:45:32 UTC
AMZN · CVSS:3.1 · 8.1
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AMZN · CVSS:4.0 · 8.6
Assessment vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high8.6

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

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.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

AWS · AMZN

strands-agents

1 range
AMZN version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 1.43.0

custom versions

unaffected

unknown

Other versions: unaffected

AWS · AMZN

strands-agents/sdk

1 range
AMZN version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 1.5.0

custom versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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).

References

4 sources
pypi.org/project/strands-agents/1.43.0/
PatchAMZN
www.npmjs.com/package/@strands-agents/sdk/v/1.5.0
PatchAMZN
aws.amazon.com/security/security-bulletins/2026-146-aws/
Vendor advisoryAMZN
strands-agents/harness-sdk · security/advisories/GHSA-4v6f-7vjh-6x4m
Security advisoryAMZN

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115419

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-488 ↗

CWE-488 Exposure of data element to wrong session

AMZN

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

AMZN · platform conditions

Any condition may hold

Any condition may hold

Vulnerable product

cpe:2.3:a:aws:strands-agents:*:*:*:*:*:*:*:*

From (inclusive): 0

Before: 1.43.0

Any condition may hold

Vulnerable product

cpe:2.3:a:aws:strands-agents_sdk:*:*:*:*:*:*:*:*

From (inclusive): 0

Before: 1.5.0

Applicability preview
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    "operator": "OR",
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            "vulnerable": true,
            "criteria": "cpe:2.3:a:aws:strands-agents:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "0",
            "versionEndExcluding": "1.43.0"
          }
        ]
      },
      {
        "operator": "OR",
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        "cpeMatch": [
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            "vulnerable": true,
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      }
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]
Contributing organizations · 2
AMZN

Assigning organization

2026-10-22
CISA-ADP

Additional data publisher

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

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No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.