CVE-2026-5504
5.3
MEDIUM
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-5504
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/wolfssl—no fix listed
Is CVE-2026-5504 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |