GHSA-65p9-r9h6-22vj: Aws lc sys AWS-LC Has Timing Side-Channel Vulnerability

HIGH
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CVSS 5.9
CWE-208
Published
Advisory Summary

GHSA-65p9-r9h6-22vj is a HIGH (CVSS 5.9) aws-lc has timing side-channel vulnerability (CWE-208: Observable Timing Discrepancy) affecting Aws lc sys libraries in the crates.io ecosystem. The issue involves aws-lc has timing side-channel in aes-ccm tag verification. Remediation is available by upgrading affected packages to version 0.38.0, 0.13.12.

GHSA-65p9-r9h6-22vj at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-65p9-r9h6-22vj
Severity HIGH
CVSS v3.1 Base Score 5.9
CWE Classification CWE-208: Observable Timing Discrepancy
Affected Product Aws lc sys
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-65p9-r9h6-22vj

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
aws-lc-fips-sys fixed: 0.13.12 
Upgrade aws-lc-fips-sys to 0.13.12
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-65p9-r9h6-22vj, 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-208: Observable Timing Discrepancy, where two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. 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 Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. 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 versions: >= 0.14.0, < 0.38.0 - aws-lc-fips-sys versions: >= v0.13.0, < 0.13.12. ### Patches The patch is included in aws-lc-sys v.0.38.0 and aws-lc-fips-sys v0.13.12. ### Workarounds In the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or (M=16, L=2), applications can workaround this issue by using AES-CCM through the EVP AEAD API using implementations EVP_aead_aes_128_ccm_bluetooth, EVP_aead_aes_128_ccm_bluetooth_8, and, EVP_aead_aes_128_ccm_matter respectively. 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. ### 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. ### Acknowledgement AWS-LC would like to thank Joshua Rogers (https://joshua.hu/) for collaborating on this issue through the coordinated vulnerability disclosure process.

GHSA-65p9-r9h6-22vj Affected Aws lc sys Versions

2 component(s)
Fixed Versions:
0.38.00.13.12
Product / Package Ecosystem Affected Versions Fixed Version
aws-lc-sys
 crates.io
≥ 0.14.0
< 0.38.0
0.38.0
aws-lc-fips-sys
 crates.io
≥ 0.13.0
< 0.13.12
0.13.12

References

GitHub Advisory / Wiki ADVISORY
https://github.com/aws/aws-lc-rs/security/advisories/GHSA-65p9-r9h6-22vj
GitHub Advisory / Wiki ADVISORY
https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh
NVD — GHSA-65p9-r9h6-22vj NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3337
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-2026-0043.html
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0045.html

Frequently Asked Questions

What is GHSA-65p9-r9h6-22vj?
GHSA-65p9-r9h6-22vj is a security vulnerability in Aws lc sys involving AWS-LC has Timing Side-Channel in AES-CCM Tag Verification under CWE-208: Observable Timing Discrepancy.
Which Aws lc sys versions are affected?
Affected versions include releases prior to 0.38.0, 0.13.12 across affected packages: aws-lc-sys, aws-lc-fips-sys.
What version fixes GHSA-65p9-r9h6-22vj?
Upgrading to 0.38.0, 0.13.12 (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.
Is aws-lc-fips-sys affected?
Yes, aws-lc-fips-sys is affected in releases prior to 0.13.12. Upgrade your dependency to 0.13.12 or later.
What is the CVSS score of GHSA-65p9-r9h6-22vj?
GHSA-65p9-r9h6-22vj has a CVSS v3.1 base score of 5.9 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with GHSA-65p9-r9h6-22vj?
GHSA-65p9-r9h6-22vj is classified under CWE-208: Observable Timing Discrepancy (Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.).
How can I check crates.io dependencies for GHSA-65p9-r9h6-22vj?
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-65p9-r9h6-22vj",
  "modified" : "2026-03-25T18:26:08Z",
  "published" : "2026-03-03T20:09:25Z",
  "aliases" : [ ],
  "summary" : "AWS-LC has Timing Side-Channel in AES-CCM Tag Verification",
  "details" : "### Summary\nAWS-LC is an open-source, general-purpose cryptographic library.\n\n### Impact\nObservable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis.\n\nThe impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.\n\nCustomers 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.\n\n### Impacted versions: \n - aws-lc-sys versions: >= 0.14.0, < 0.38.0\n - aws-lc-fips-sys versions: >= v0.13.0, < 0.13.12.\n\n### Patches\nThe patch is included in aws-lc-sys v.0.38.0 and aws-lc-fips-sys v0.13.12.\n\n### Workarounds\nIn the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or (M=16, L=2), applications can workaround this issue by using AES-CCM through the EVP AEAD API using implementations EVP_aead_aes_128_ccm_bluetooth, EVP_aead_aes_128_ccm_bluetooth_8, and, EVP_aead_aes_128_ccm_matter respectively.\n\nOtherwise, 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.\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.\n\n### Acknowledgement\nAWS-LC would like to thank Joshua Rogers (https://joshua.hu/) for collaborating on this issue through the coordinated vulnerability disclosure process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "aws-lc-sys"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.14.0"
      }, {
        "fixed" : "0.38.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "aws-lc-fips-sys"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.13.0"
      }, {
        "fixed" : "0.13.12"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/aws/aws-lc-rs/security/advisories/GHSA-65p9-r9h6-22vj"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-3337"
  }, {
    "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-2026-0043.html"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0045.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-208" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-03T20:09:25Z",
    "nvd_published_at" : null
  }
}