CVE-2026-2646

HighCVSS 8.1/10Last modified Jun 17, 2026

Description

A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-122 CWE-787

Affected software

Vendor	Product	Versions
wolfssl	wolfssl	<= 5.8.4

References

https://github.com/wolfSSL/wolfssl/pull/9748Issue Tracking, Patch
https://github.com/wolfSSL/wolfssl/pull/9949Issue Tracking, Patch

Timeline

Published: Mar 19, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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