Out-of-bounds write in wolfSSL - CVE-2026-6681
Published: July 1, 2026
Vulnerability identifier: #VU136650
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-6681
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause memory corruption.
The vulnerability exists due to an out-of-bounds write in the PKCS#7 decode path when decoding content into a caller-supplied output buffer. A remote attacker can supply crafted PKCS#7 data to cause memory corruption.
This affects wolfSSL 5.9.0 and earlier.
How to mitigate CVE-2026-6681
Install security update from vendor's website.