Vulnerability-Lookup

CVE-2026-3338 (GCVE-0-2026-3338)

Vulnerability from cvelistv5 – Published: 2026-03-02 21:22 – Updated: 2026-03-03 14:39

Title

PKCS7_verify Signature Validation Bypass in AWS-LC

Summary

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. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CWE

CWE-347 - (Improper Verification of Cryptographic Signature)

Assigner

AMZN

References

URL

Tags

	https://aws.amazon.com/security/security-bulletin…	vendor-advisory
	https://github.com/aws/aws-lc/releases/tag/v1.69.0	patch
	https://github.com/aws/aws-lc/security/advisories…	third-party-advisory

Impacted products

	Vendor	Product	Version
	AWS	AWS-LC	Affected: 1.41.0 , < 1.69.0 (custom)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-3338

Vulnerability from fkie_nvd - Published: 2026-03-02 22:16 - Updated: 2026-03-11 16:54

Severity ?

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

Summary

References

URL	Tags
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://aws.amazon.com/security/security-bulletins/2026-005-AWS/	Vendor Advisory
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/aws/aws-lc/releases/tag/v1.69.0	Release Notes
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj	Vendor Advisory

Impacted products

	Vendor	Product	Version
	amazon	aws-lc-sys	*
	amazon	aws_libcrypto	*

JSON

To clipboard

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    }
  ],
  "sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "type": "Secondary"
    }
  ]
}

MSRC_CVE-2026-3338

Vulnerability from csaf_microsoft - Published: 2026-03-02 00:00 - Updated: 2026-03-06 01:38

Summary

PKCS7_verify Signature Validation Bypass in AWS-LC

Notes

Additional Resources

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer

The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-3338 PKCS7_verify Signature Validation Bypass in AWS-LC - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-3338.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "PKCS7_verify Signature Validation Bypass in AWS-LC",
    "tracking": {
      "current_release_date": "2026-03-06T01:38:11.000Z",
      "generator": {
        "date": "2026-03-06T08:01:25.307Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-3338",
      "initial_release_date": "2026-03-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-03-05T01:08:53.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-03-06T01:38:11.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "2.0",
                "product": {
                  "name": "CBL Mariner 2.0",
                  "product_id": "17086"
                }
              },
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 grpc 1.62.3-1",
                "product": {
                  "name": "azl3 grpc 1.62.3-1",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "grpc"
          },
          {
            "category": "product_name",
            "name": "cbl2 tensorflow 2.11.1-2",
            "product": {
              "name": "cbl2 tensorflow 2.11.1-2",
              "product_id": "2"
            }
          },
          {
            "category": "product_name",
            "name": "azl3 tensorflow 2.16.1-11",
            "product": {
              "name": "azl3 tensorflow 2.16.1-11",
              "product_id": "1"
            }
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "cbl2 tensorflow 2.11.1-2 as a component of CBL Mariner 2.0",
          "product_id": "17086-2"
        },
        "product_reference": "2",
        "relates_to_product_reference": "17086"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 tensorflow 2.16.1-11 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 grpc 1.62.3-1 as a component of Azure Linux 3.0",
          "product_id": "17084-3"
        },
        "product_reference": "3",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-3338",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
      },
      "flags": [
        {
          "label": "component_not_present",
          "product_ids": [
            "17086-2",
            "17084-1"
          ]
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "AMZN",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-3"
        ],
        "known_not_affected": [
          "17086-2",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-3338 PKCS7_verify Signature Validation Bypass in AWS-LC - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-3338.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-03-05T01:08:53.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-3"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 7.5,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "17084-3"
          ]
        }
      ],
      "title": "PKCS7_verify Signature Validation Bypass in AWS-LC"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-3338 (GCVE-0-2026-3338)

FKIE_CVE-2026-3338

MSRC_CVE-2026-3338

Tags

Sightings

Nomenclature