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Bedrock AgentCore SDK EUVDEUVD-2026-48422

| CVE-2026-16796 HIGH
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (CWE-88)
2026-07-23 AMZN GHSA-j6g5-3hh3-pgw8
RCE Python Bedrock Agentcore 1 18 1
8.4
CVSS 4.0 · Vendor: AMZN
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Severity by source

Vendor (AMZN) PRIMARY
8.4 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.3 HIGH

Authenticated user supplies input (PR:L) with required interaction (UI:R); command execution stays within the sandbox authority (S:U) yielding high confidentiality and integrity but no availability impact.

3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (AMZN).

CVSS VectorVendor: AMZN

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
A
Scope
X

Lifecycle Timeline

5
Analysis Updated
Jul 23, 2026 - 21:30 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 23, 2026 - 21:23 vuln.today
cvss_changed
CVSS changed
Jul 23, 2026 - 21:23 NVD
7.3 (HIGH) 8.4 (HIGH)
Analysis Generated
Jul 23, 2026 - 20:50 vuln.today
CVE Published
Jul 23, 2026 - 20:06 cve.org
HIGH 7.3

DescriptionCVE.org

Improper neutralization of argument delimiters in the install_packages() method in AWS Bedrock AgentCore Python SDK before 1.18.1 might allow a remote authenticated user to execute arbitrary commands within the Code Interpreter sandbox via crafted package name arguments.

To mitigate this issue, users should upgrade to the patched version 1.18.1.

Articles & Coverage 1

News 3 New Python Vulnerabilities - 1 Critical, 2 High Severity Jul 24, 2026

AnalysisAI

Argument injection in the AWS Bedrock AgentCore Python SDK before 1.18.1 lets a remote authenticated user run arbitrary commands inside the Code Interpreter sandbox by embedding shell/argument delimiters in package names passed to install_packages(). Because the CVSS vector is PR:L, an attacker needs some level of authenticated access and the flaw requires user interaction (UI:A) with a high confidentiality and integrity impact (CVSS 4.0 base 8.4). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to AgentCore environment
Delivery
Supply crafted package name to install_packages()
Exploit
Argument delimiters reinterpreted as command options
Execution
Execute arbitrary commands in Code Interpreter sandbox
Impact
Access or tamper with sandbox data
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated AgentCore user (CVSS PR:L) and active user interaction (UI:A), and specifically requires that the crafted, attacker-controlled input reaches the install_packages() method of the Bedrock AgentCore Python SDK as a package name argument - i.e. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are moderately concerning but not emergency-tier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated user (or an agent whose package input the user can influence) submits a crafted package name containing argument delimiters to a workflow that calls install_packages(); the delimiters are interpreted as extra command options or a chained command, causing arbitrary commands to run inside the Code Interpreter sandbox. Because the attack requires active user interaction and authenticated access, a realistic path is a malicious or manipulated agent instruction that supplies the poisoned package string during a code-execution session. …
Remediation Vendor-released patch: upgrade the bedrock-agentcore Python package to version 1.18.1 or later (for example via 'pip install --upgrade bedrock-agentcore==1.18.1'), as directed by AWS security bulletin 2026-065 (https://aws.amazon.com/security/security-bulletins/2026-065-aws/) and advisory GHSA-j6g5-3hh3-pgw8. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running AWS Bedrock AgentCore Python SDK and identify those on versions prior to 1.18.1. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-48422 vulnerability details – vuln.today
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