Summary
AWS SDK for Swift adopted defense in depth enhancement for region parameter value
CVSSv3.1 Rating: 3.7 (LOW)
Summary
This notification is related to the use of specific values for the region input field when calling AWS services. An actor with access to the environment in which the SDK is used could set the region input field to an invalid value.
A defense-in-depth enhancement has been implemented in the AWS SDK for Swift. This enhancement validates that a region used to construct an endpoint URL is a valid host label. The change was released on November 6, 2025. This advisory is informational to help customers understand their responsibilities regarding configuration security.
Impact
Customer applications could be configured to improperly route AWS API calls to non-existent or non-AWS hosts. While the SDK was functioning safely within the requirements of the shared responsibility model, additional safeguards have been added to support secure customer implementations.
Impacted versions: All versions prior to 2025-11-06 release (below 1.5.79)
Patches
On November 6, 2025 an enhancement was made to the AWS SDK for Swift release, which validates the formatting of a region, providing additional safeguards.
Workarounds
No workarounds are needed, but as always you should ensure that your application is following security best practices:
- Implement proper input validation in your application code
- Update to the latest AWS SDK for Swift release on a regular basis
- Follow AWS security best practices [1] for SDK configuration
References
Contact AWS Security via the vulnerability reporting page or email [email protected].
Acknowledgement
AWS SDK thanks Guy Arazi for bringing these customer security considerations to our attention through the coordinated disclosure process.
[1] https://docs.aws.amazon.com/sdk-for-swift/latest/developer-guide/security.html
Impact
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
GHSA-PC9J-5V36-2MWW has a CVSS score of 3.7 (Low). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.5.79); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-PC9J-5V36-2MWW? GHSA-PC9J-5V36-2MWW is a low-severity improper input validation vulnerability in github.com/awslabs/aws-sdk-swift (swift), affecting versions < 1.5.79. It is fixed in 1.5.79. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- How severe is GHSA-PC9J-5V36-2MWW? GHSA-PC9J-5V36-2MWW has a CVSS score of 3.7 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of github.com/awslabs/aws-sdk-swift are affected by GHSA-PC9J-5V36-2MWW? github.com/awslabs/aws-sdk-swift (swift) versions < 1.5.79 is affected.
- Is there a fix for GHSA-PC9J-5V36-2MWW? Yes. GHSA-PC9J-5V36-2MWW is fixed in 1.5.79. Upgrade to this version or later.
- Is GHSA-PC9J-5V36-2MWW exploitable, and should I be worried? Whether GHSA-PC9J-5V36-2MWW is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-PC9J-5V36-2MWW is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-PC9J-5V36-2MWW? Upgrade
github.com/awslabs/aws-sdk-swiftto 1.5.79 or later.