What is CVE-2026-5778?

CVE-2026-5778 is a medium-severity vulnerability in Wolfssl, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-04-09.

How severe is CVE-2026-5778?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Integer overflow in Wolfssl

CVE-2026-5778

Integer underflow in wolfSSL packet sniffer <= 5.9.0 allows an attacker to cause a program crash in the AEAD decryption path by injecting a TLS record shorter than the explicit IV plus authentication tag into traffic inspected by ssl_Decod…

EPSS: 0.001 (16.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5778?: CVE-2026-5778 is a medium-severity vulnerability in Wolfssl, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-04-09.
How severe is CVE-2026-5778?: Medium severity. CVSS v3 base score is 6.5 out of 10.