Is this vulnerability remotely exploitable?

It can be, if an application exposes an interface that accepts PKCS7-signed data from remote users and uses PKCS7_verify() for trust decisions. In that case, a remote attacker could craft multi-signer PKCS7 objects to exploit the incomplete certificate validation.

Does an attacker need prior authentication or special access?

Not necessarily. If the PKCS7 verification endpoint is public (for example, a service that validates signed files, tokens, or messages), an unauthenticated attacker who can send PKCS7 data to the service may attempt exploitation. If PKCS7 data is only accepted from authenticated or internal sources, the attacker would need whatever access is required to reach that path.

What is the safest general fix pattern?

The safest pattern is to ensure robust, explicit certificate-chain validation for all signers independent of any single library convenience function. Applications should validate each signer's certificate against a defined trust store, check required certificate policies and usages, and fail closed when validation is incomplete or ambiguous.

Severity:

HIGH RISK

(7.5)

Improper Certificate Validation (CWE-295) in AWS-LC PKCS7_verify()

CVE-2026-3336

Published:

Mar 2, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Improper Certificate Validation

CWE:

CWE-295

Impact:

Authentication Bypass / Signature Trust Bypass

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Certificate Validation

CWE:

CWE-295

Impact:

Authentication Bypass / Signature Trust Bypass

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Improper Certificate Validation (CWE-295) in AWS-LC PKCS7_verify()

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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