GHSA-hfpc-8r3f-gw53: Aws lc sys AWS-LC Has PKCS7_verify Signature Validation Vulnerability

HIGH
Share
CVSS 7.5
CWE-347
Published
Advisory Summary

GHSA-hfpc-8r3f-gw53 is a HIGH (CVSS 7.5) aws-lc has pkcs7_verify signature validation vulnerability (CWE-347: Improper Verification of Cryptographic Signature) affecting Aws lc sys libraries in the crates.io ecosystem. The issue involves aws-lc has pkcs7_verify signature validation bypass. Remediation is available by upgrading affected packages to version 0.38.0.

GHSA-hfpc-8r3f-gw53 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-hfpc-8r3f-gw53
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-347: Improper Verification of Cryptographic Signature
Affected Product Aws lc sys
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix GHSA-hfpc-8r3f-gw53

To remediate this vulnerability, upgrade all affected Aws lc sys dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

aws-lc-sys fixed: 0.38.0 
Upgrade aws-lc-sys to 0.38.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for aws-lc-sys

How to Check if You Are Affected

To determine whether your application is affected by GHSA-hfpc-8r3f-gw53, inspect your project dependencies for Aws lc sys:

inspect dependencies for aws-lc-sys

Analyze the terminal output to locate any version of Aws lc sys in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.38.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-347: Improper Verification of Cryptographic Signature, where the product does not verify, or incorrectly verifies, the cryptographic signature for data. In Aws lc sys, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary AWS-LC is an open-source, general-purpose cryptographic library. ### Impact Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. 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. #### Impacted versions: aws-lc-sys versions: >= 0.24.0, < 0.38.0 ### Patches The patch is included in v0.38.0 ### 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](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.

GHSA-hfpc-8r3f-gw53 Affected Aws lc sys Versions

1 component(s)
Fixed Versions:
0.38.0
Product / Package Ecosystem Affected Versions Fixed Version
aws-lc-sys
 crates.io
≥ 0.24.0
< 0.38.0
0.38.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/aws/aws-lc-rs/security/advisories/GHSA-hfpc-8r3f-gw53
GitHub Advisory / Wiki ADVISORY
https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
NVD — GHSA-hfpc-8r3f-gw53 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3338
Aws lc sys Security Information SECURITY
https://aws.amazon.com/security/security-bulletins/2026-005-AWS
Aws lc sys Source Repository REPOSITORY
https://github.com/aws/aws-lc-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0047.html

Frequently Asked Questions

What is GHSA-hfpc-8r3f-gw53?
GHSA-hfpc-8r3f-gw53 is a security vulnerability in Aws lc sys involving AWS-LC has PKCS7_verify Signature Validation Bypass under CWE-347: Improper Verification of Cryptographic Signature.
Which Aws lc sys versions are affected?
Affected versions include releases prior to 0.38.0 across affected packages: aws-lc-sys.
What version fixes GHSA-hfpc-8r3f-gw53?
Upgrading to 0.38.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is aws-lc-sys affected?
Yes, aws-lc-sys is affected in releases prior to 0.38.0. Upgrade your dependency to 0.38.0 or later.
What is the CVSS score of GHSA-hfpc-8r3f-gw53?
GHSA-hfpc-8r3f-gw53 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with GHSA-hfpc-8r3f-gw53?
GHSA-hfpc-8r3f-gw53 is classified under CWE-347: Improper Verification of Cryptographic Signature (The product does not verify, or incorrectly verifies, the cryptographic signature for data.).
How can I check crates.io dependencies for GHSA-hfpc-8r3f-gw53?
Run the dependency tree command: 'inspect dependencies for aws-lc-sys'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hfpc-8r3f-gw53",
  "modified" : "2026-03-25T18:31:14Z",
  "published" : "2026-03-03T20:25:39Z",
  "aliases" : [ ],
  "summary" : "AWS-LC has PKCS7_verify Signature Validation Bypass",
  "details" : "### Summary\nAWS-LC is an open-source, general-purpose cryptographic library.\n\n### Impact\nImproper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes.\n\nCustomers 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.\n\n#### Impacted versions: \naws-lc-sys versions: >= 0.24.0, < 0.38.0\n\n### Patches\nThe patch is included in v0.38.0\n\n### Workarounds\nThere is no workaround. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.\n\n### Resources\nIf there are any questions or comments about this advisory, contact [AWS/Amazon] Security via the [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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "aws-lc-sys"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.24.0"
      }, {
        "fixed" : "0.38.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/aws/aws-lc-rs/security/advisories/GHSA-hfpc-8r3f-gw53"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-3338"
  }, {
    "type" : "WEB",
    "url" : "https://aws.amazon.com/security/security-bulletins/2026-005-AWS"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/aws/aws-lc-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0047.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-347" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-03T20:25:39Z",
    "nvd_published_at" : null
  }
}