Summary
AWS-LC is an open-source, general-purpose cryptographic library.
Impacted versions:
aws-lc-sys versions: >= 0.24.0, < 0.38.0
Workarounds
There is no workaround. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.
Resources
If there are any questions or comments about this advisory, contact [AWS/Amazon] Security via the vulnerability reporting page or directly via email to [email protected]. Please do not create a public GitHub issue.
Acknowledgement
AWS-LC would like to thank Joshua Rogers (https://joshua.hu/) for collaborating on this issue through the coordinated vulnerability disclosure process.
Impact
Improper certificate validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer.
Customers of AWS services do not need to take action. aws-lc-sys contains code from AWS-LC. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.
GHSA-VW5V-4F2Q-W9XF has a CVSS score of 7.5 (High). 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 (0.38.0); 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.
Remediation advice
The patch is included in v0.38.0
Frequently Asked Questions
- What is GHSA-VW5V-4F2Q-W9XF? GHSA-VW5V-4F2Q-W9XF is a high-severity security vulnerability in aws-lc-sys (rust), affecting versions >= 0.24.0, < 0.38.0. It is fixed in 0.38.0.
- How severe is GHSA-VW5V-4F2Q-W9XF? GHSA-VW5V-4F2Q-W9XF has a CVSS score of 7.5 (High). 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 aws-lc-sys are affected by GHSA-VW5V-4F2Q-W9XF? aws-lc-sys (rust) versions >= 0.24.0, < 0.38.0 is affected.
- Is there a fix for GHSA-VW5V-4F2Q-W9XF? Yes. GHSA-VW5V-4F2Q-W9XF is fixed in 0.38.0. Upgrade to this version or later.
- Is GHSA-VW5V-4F2Q-W9XF exploitable, and should I be worried? Whether GHSA-VW5V-4F2Q-W9XF 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-VW5V-4F2Q-W9XF 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-VW5V-4F2Q-W9XF? Upgrade
aws-lc-systo 0.38.0 or later.