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.
Published: 2026-04-10
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
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Remediation

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History

Wed, 29 Apr 2026 16:15:00 +0200

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 17:15:00 +0200

Type Values Removed Values Added
Metrics ssvc

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


Fri, 10 Apr 2026 11:00:00 +0200

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

Fri, 10 Apr 2026 00:45:00 +0200

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:

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: 2026-06-17T10:59:08.143

Link: CVE-2026-5504

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-10T11:27:35Z

Weaknesses
  • CWE-354

    Improper Validation of Integrity Check Value