#VU125942 Integer underflow in wolfSSL - CVE-2026-5778
Published: April 14, 2026
Vulnerability identifier: #VU125942
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5778
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
wolfSSL
wolfSSL
Software vendor:
wolfSSL
wolfSSL
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an integer underflow leading to an out-of-bounds read in the ChaCha20-Poly1305 decryption path when processing a malformed TLS 1.2 record with a payload shorter than the AEAD MAC size. A remote attacker can send a malformed TLS 1.2 record to cause a denial of service.
This only affects sniffer builds.
Remediation
Install security update from vendor's website.