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.
History

Wed, 29 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


Tue, 14 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 10 Apr 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Wolfssl
Wolfssl wolfssl
Vendors & Products Wolfssl
Wolfssl wolfssl

Thu, 09 Apr 2026 22:45:00 +0000

Type Values Removed Values Added
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.
Title PKCS7 CBC Padding Oracle — Plaintext Recovery
Weaknesses CWE-354
References
Metrics cvssV4_0

{'score': 6.3, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: wolfSSL

Published: 2026-04-09T22:33:42.179Z

Updated: 2026-04-14T14:34:40.546Z

Reserved: 2026-04-03T16:06:24.620Z

Link: CVE-2026-5504

cve-icon Vulnrichment

Updated: 2026-04-14T14:34:00.312Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-09T23:17:01.400

Modified: 2026-04-29T14:06:58.727

Link: CVE-2026-5504

cve-icon Redhat

No data.