rustsec-2026-0046
Vulnerability from osv_rustsec
Published
2026-03-02 12:00
Modified
2026-03-21 06:45
Summary
PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
Details

Improper certificate validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer.

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.

There is no workaround; applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "aws-lc-sys",
        "purl": "pkg:cargo/aws-lc-sys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.24.0"
            },
            {
              "fixed": "0.38.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-3336",
    "GHSA-cfwj-9wp5-wqvp",
    "GHSA-vw5v-4f2q-w9xf"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Improper certificate validation in `PKCS7_verify()` in AWS-LC allows an\nunauthenticated user to bypass certificate chain verification when processing\nPKCS7 objects with multiple signers, except the final signer.\n\nCustomers of AWS services do not need to take action. `aws-lc-sys` contains\ncode from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most\nrecent release of `aws-lc-sys`.\n\nThere is no workaround; applications using `aws-lc-sys` should upgrade to the \nmost recent release of aws-lc-sys.",
  "id": "RUSTSEC-2026-0046",
  "modified": "2026-03-21T06:45:35Z",
  "published": "2026-03-02T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/aws-lc-sys"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0046.html"
    },
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-005-AWS"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/aws/aws-lc-rs/security/advisories/GHSA-vw5v-4f2q-w9xf"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PKCS7_verify Certificate Chain Validation Bypass in AWS-LC"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.