GHSA-pp64-wj43-xqcr is a medium-severity (CVSS 6.5) CWE-61 vulnerability in aws-sam-cli. A fix is available for aws-sam-cli — see the affected versions and patch details below.
AWS SAM CLI Path Traversal allows file copy to local cache
Exploitation Status
No confirmed exploitation observed yet
- 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 GHSA-pp64-wj43-xqcr.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-pp64-wj43-xqcr plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 379,145 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
aws-sam-cliReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Summary
The AWS Serverless Application Model Command Line Interface (AWS SAM CLI) is an open-source CLI tool that helps Lambda developers to build and develop Lambda applications locally on their computers using Docker.
After completing a build with AWS SAM CLI which include symlinks, the content of those symlinks are copied to the cache of the local workspace as regular files or directories. As a result, a user who does not have access to those symlinks outside of the Docker container would now have access via the local workspace.
Users should upgrade to v1.134.0 or newer and ensure any forked or derivative code is patched to incorporate the new fixes. After upgrading, users must re-build their applications using the sam build --use-container to update the symlinks.
Impact
The issue is limited to the local workspace and does not affect AWS services, production environments or cross-account resources. The issue only affects workspaces using the AWS SAM CLI with container builds (--use-container), potentially allowing access to content of linked files in the SAM CLI cache.
Impacted versions: <= AWS SAM CLI v1.133.0
Patches
The patches are included in AWS SAM CLI version to v1.134.0 and newer. Users should upgrade and ensure any forked or derivative code is patched to incorporate the new fixes. After upgrading, users must re-build their applications using the sam build --use-container to update the symlinks
Workarounds
There is no recommended work around. Customers are advised to upgrade to version v1.134.0 or the latest version.
References
CVE-2025-3048
If you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.
Credit
We would like to thank Kevin Backhouse with the GitHub Security Lab for collaborating on this issue through the coordinated vulnerability disclosure process.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | aws-sam-cli | all versions | 1.134.0pip install --upgrade 'aws-sam-cli==1.134.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aws-sam-cli, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update aws-sam-cli to 1.134.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pp64-wj43-xqcr is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-pp64-wj43-xqcr can be triaged on real exposure rather than presence alone.
Tailored to GHSA-pp64-wj43-xqcr. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-pp64-wj43-xqcr in your dependencies?
O3 Security finds GHSA-pp64-wj43-xqcr across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.