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CVE-2026-4428 — Vulnerability in aws-lc-fips-sys — CVE Details

HIGH

CRL Distribution Point Scope Check Logic Error in AWS-LC

Published March 20, 2026Updated September 10, 2026Source: osv

Summary

### Summary AWS-LC is an open-source, general-purpose cryptographic library. ### Impact A logic error in CRL distribution point matching in AWS-LC allows a revoked certificate to bypass revocation checks during certificate validation, when the application enables CRL checking and uses partitioned CRLs with Issuing Distribution Point (IDP) extensions. Customers of AWS services do not need to take action. aws-lc-sys and aws-lc-fips-sys contain code from AWS-LC. Applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys. ### Impacted versions: * aws-lc-sys >= v0.15.0, < v0.39.0 * aws-lc-fips-sys >= v0.13.0, < v0.13.13 ### Patches The patch is included in aws-lc-sys v0.39.0 and aws-lc-fips-sys v0.13.13. ### Workarounds Applications can workaround this issue if they do not enable CRL checking (X509_V_FLAG_CRL_CHECK). Applications using complete (non-partitioned) CRLs without IDP extensions are also not affected. Otherwise, there is no workaround and applications using aws-lc-sys or aws-lc-fips-sys should upgrade to the most recent releases of aws-lc-sys or aws-lc-fips-sys. ### References If you have any questions or comments about this advisory, we ask that you contact AWS Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.

Advisory Timeline

  • First published March 20, 2026 (206 days ago).
  • Last revised September 10, 2026 — 173 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update aws-lc-fips-sys to 0.13.13 or later
cargo update -p aws-lc-fips-sys --precise 0.13.13
Cargo
Update aws-lc-sys to 0.39.0 or later
cargo update -p aws-lc-sys --precise 0.39.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: crates.io (2).

PackageEcosystemAffectedFixed In
aws-lc-fips-sys
crates.io
All versions0.13.13
aws-lc-sys
crates.io
All versions0.39.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-295
    Improper Certificate ValidationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-4428?
CRL Distribution Point Scope Check Logic Error in AWS-LC This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.4/10).
How do I check if my project is affected by CVE-2026-4428?
CVE-2026-4428 affects aws-lc-fips-sys and aws-lc-sys. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-4428 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.4

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-9f94-5g5w-gf6r
RUSTSEC-2026-0042
RUSTSEC-2026-0048

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