PT-2026-26376 · Wolfssl · Wolfssl

Haruto Kimura · Published 2026-03-19 · Updated 2026-04-30 · CVE-2026-4159

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions wolfSSL versions 5.8.4 and earlier

Description An out-of-bounds heap read issue exists in the wc PKCS7 DecodeEnvelopedData function when processing crafted CMS EnvelopedData messages containing zero-length encrypted content. This issue could lead to a 1-byte heap read outside of allocated memory boundaries. Note that PKCS7 support is disabled by default.

Recommendations Update wolfSSL to a version later than 5.8.4.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-4159

Affected Products

Wolfssl

References · 9

• https://github.com/wolfSSL/wolfssl/pull/9945 · Patch
• https://ubuntu.com/security/CVE-2026-4159 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4159 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-4159 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4159 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-4159 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4159 · Vendor Advisory
• https://t.me/msrcreports/4075 · Telegram Post
• https://twitter.com/CVEnew/status/2034891632277852533 · Twitter Post