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High, CVSS 7.5

AWS-LC has PKCS7_verify Signature Validation Bypass

GHSA-hfpc-8r3f-gw53

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (aws-lc-sys 0.38.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io aws-lc-sys

    Affected
    >= 0.24.0, < 0.38.0
    Fixed in
    0.38.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary AWS-LC is an open-source, general-purpose cryptographic library. Impact Improper signature validation in PKCS7verify() 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 or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hfpc-8r3f-gw53

Agent brief

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# Patch Next advisory brief: GHSA-hfpc-8r3f-gw53

Advisory: AWS-LC has PKCS7_verify Signature Validation Bypass
IDs: GHSA-hfpc-8r3f-gw53
Record: https://patchnext.com/advisories/ghsa-hfpc-8r3f-gw53 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: aws-lc-sys 0.38.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io aws-lc-sys: affected >= 0.24.0, < 0.38.0; fixed in 0.38.0

## Suggested inspection (read-only)
- crates.io aws-lc-sys: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on aws-lc-sys.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hfpc-8r3f-gw53 (GitHub-reviewed advisory GHSA-hfpc-8r3f-gw53 lists affected ranges: crates.io aws-lc-sys >=0.24.0 <0.38.0)

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