CVE-2026-2646

MEDIUM EPSS 2.4%
Published Mar 19, 20263mo ago · Modified Jun 17, 20261w ago
5.0 CVSS 4.0
Medium
Find Similar
Published Mar 19, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.0
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-122
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

VendorProductVersionRange
wolfsslwolfssl* <5.9.0

References 2

  • github.com https://github.com/wolfSSL/wolfssl/pull/9748
    Issue TrackingPatch
  • github.com https://github.com/wolfSSL/wolfssl/pull/9949
    Issue TrackingPatch

Remediation

  • github.com https://github.com/wolfSSL/wolfssl/pull/9748
    Issue TrackingPatch
  • github.com https://github.com/wolfSSL/wolfssl/pull/9949
    Issue TrackingPatch