How severe is CVE-2026-11400?

No CVSS score has been assigned to CVE-2026-11400 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-11400?

CVE-2026-11400 affects the following packages: software.amazon.jdbc:aws-advanced-jdbc-wrapper (Maven). Ecosystems affected: Maven.

How do I fix CVE-2026-11400?

Update software.amazon.jdbc:aws-advanced-jdbc-wrapper to 4.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-11400 is resolved across your whole dependency graph.

How do I detect CVE-2026-11400 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for software.amazon.jdbc:aws-advanced-jdbc-wrapper, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-11400 if there is no patch (or I can't update yet)?

Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Is CVE-2026-11400 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-11400 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-11400?

CVE-2026-11400 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 21th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-11400?

CVE-2026-11400 is classified as CWE-426 (CWE-426). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-11400 published, and has it been updated?

CVE-2026-11400 was published on June 5, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

CVE-2026-11400 — aws-advanced-jdbc-wrapper

CVE-2026-11400 is a CWE-426 vulnerability in software.amazon.jdbc:aws-advanced-jdbc-wrapper. A fix is available for software.amazon.jdbc:aws-advanced-jdbc-wrapper — see the affected versions and patch details below.

Privilege Escalation in AWS Advanced JDBC Wrapper for Amazon Aurora PostgreSQL

Also known asGHSA-mhww-p97m-3368

Published

Jun 5, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-11400.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs21th percentile — riskier than 21% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

☕software.amazon.jdbc:aws-advanced-jdbc-wrapper

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Aurora PostgreSQL is a fully managed relational database engine that's compatible with PostgreSQL.

The team has identified CVE-2026-11400, an issue in Aurora PostgreSQL using the AWS Advanced JDBC Wrapper

Impact An issue in AWS Wrappers for Amazon Aurora PostgreSQL will allow for privilege escalation to rds_superuser role. A low privilege authenticated user can create a crafted function that could be executed with permissions of other Amazon Relational Database Service (RDS) users.

Impacted versions: AWS Advanced JDBC Wrapper >= 3.0.0 and < 4.0.1

Patches This issue has been addressed in AWS JDBC Wrapper v4.0.1. It is recommended to upgrade to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds Remove the public schema from the search path.

Resources If there are any questions or comments about this advisory, contact [AWS/Amazon] Security via vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.

Acknowledgement

AWS-JDBC Wrapper would like to thank x.com/ph0smet for collaborating on this issue through the coordinated vulnerability disclosure process.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`software.amazon.jdbc:aws-advanced-jdbc-wrapper`	≥ 3.0.0&&< 4.0.1	4.0.1`software.amazon.jdbc:aws-advanced-jdbc-wrapper:4.0.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for software.amazon.jdbc:aws-advanced-jdbc-wrapper, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update software.amazon.jdbc:aws-advanced-jdbc-wrapper to 4.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-11400 is resolved across your whole dependency graph.
Workarounds
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Frequently Asked Questions

Aurora PostgreSQL is a fully managed relational database engine that's compatible with PostgreSQL. The team has identified CVE-2026-11400, an issue in Aurora PostgreSQL using the AWS Advanced JDBC Wrapper Impact An issue in AWS Wrappers for Amazon Aurora PostgreSQL will allow for privilege escalation to rds_superuser role. A low privilege authenticated user can create a crafted function that could be executed with permissions of other Amazon Relational Database Service (RDS) users. Impacted versions: AWS Advanced JDBC Wrapper >= 3.0.0 and < 4.0.1 Patches This issue has been addressed in

O3 Security · Impact-Aware SCA

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