Executive Summary

CVE-2026-5392 is a security vulnerability in the wolfSSL cryptographic library related to the PKCS7 streaming parser. Specifically, it is a heap out-of-bounds (OOB) read issue that occurs during the parsing of indefinite-length PKCS7 messages. The vulnerability arises because the parser lacks proper bounds checking in the indefinite-length end-of-content verification loop within the PKCS7_VerifySignedData() function.

This missing bounds check allows a crafted PKCS7 message to trigger an out-of-bounds read on the heap, potentially leading to memory corruption or other security risks. The issue was fixed by adding validation to ensure that the parsing process does not exceed buffer limits when handling the end-of-content markers in PKCS7 streaming mode.

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Compliance Impact

The provided information does not specify any direct impact of the CVE-2026-5392 vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Impact Analysis

This vulnerability can impact you by allowing a specially crafted PKCS7 message to cause an out-of-bounds read on the heap during cryptographic message parsing in wolfSSL. Such out-of-bounds memory access can lead to memory corruption, which may result in application crashes, denial of service, or potentially enable an attacker to execute arbitrary code or leak sensitive information.

Because the vulnerability affects the integrity of memory handling in a cryptographic library, it can undermine the security and stability of applications relying on wolfSSL for PKCS7 message verification.

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Mitigation Strategies

To mitigate the CVE-2026-5392 vulnerability, you should update the wolfSSL library to version 5.9.1 or later, which includes the patch that adds necessary bounds checks to the PKCS7 streaming indefinite-length end-of-content parsing.

This update prevents out-of-bounds reads on the heap by ensuring safe parsing of indefinite-length PKCS7 data streams, thereby mitigating potential memory corruption or security risks.

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