#VU125936 Observable discrepancy in wolfSSL - CVE-2026-5504

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Main Vulnerability Database Vulnerabilities #VU125936

#VU125936 Observable discrepancy in wolfSSL - CVE-2026-5504

Published: April 14, 2026


Vulnerability identifier: #VU125936
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5504
CWE-ID: CWE-203
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
wolfSSL
Software vendor:
wolfSSL

Description

The vulnerability allows a remote attacker to recover plaintext.

The vulnerability exists due to improper cryptographic validation in PKCS7 CBC decryption when processing modified ciphertext through repeated decryption queries. A remote attacker can submit modified ciphertexts to recover plaintext.

In affected versions, the interior padding bytes are not validated.


Remediation

Install security update from vendor's website.

External links