CVE-2026-5504

| EUVD-2026-21235 MEDIUM
2026-04-09 [email protected] GHSA-qvjw-73xm-jw34
6.3
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
EUVD ID Assigned
Apr 09, 2026 - 23:22 euvd
EUVD-2026-21235
Analysis Generated
Apr 09, 2026 - 23:22 vuln.today
CVE Published
Apr 09, 2026 - 23:17 nvd
MEDIUM 6.3

Tags

Information Disclosure Oracle

Description

A padding oracle exists in wolfSSL's PKCS7 CBC decryption that could allow an attacker to recover plaintext through repeated decryption queries with modified ciphertext. In previous versions of wolfSSL the interior padding bytes are not validated.

Analysis

Padding oracle vulnerability in wolfSSL's PKCS7 CBC decryption allows unauthenticated remote attackers to recover plaintext through repeated decryption queries with modified ciphertext, exploiting insufficient validation of interior padding bytes. The vulnerability requires high attack complexity and persistent attacker interaction but presents practical risk to systems using affected wolfSSL versions for PKCS7-encrypted communications.

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Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +32
POC: 0

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CVE-2026-5504 vulnerability details – vuln.today
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