PT-2026-31817 · Wolfssl · Wolfssl

Seunghyun Yoon + 2 · Published 2026-04-09 · Updated 2026-04-30 · CVE-2026-5504

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions wolfSSL (affected versions not specified)

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. The interior padding bytes are not validated.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-354

Related Identifiers

CVE-2026-5504

Affected Products

Wolfssl

References · 10

• https://github.com/wolfSSL/wolfssl/pull/10088 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5504 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5504 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-5504 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5504 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5504 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5504 · Security Note
• https://t.me/msrcreports/4083 · Telegram Post
• https://twitter.com/infoflowcloud/status/2042389904525595107 · Twitter Post
• https://twitter.com/CVEnew/status/2042387942459719685 · Twitter Post