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CVE-2026-2646— Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function

Quick assessment

Affected
wolfssl wolfssl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞，该漏洞源于wolfSSL_d2i_SSL_SESSION函数存在堆缓冲区溢出，当反序列化启用了SESSION_CERTS的会话数据时，可能导致攻击者溢出固定大小的缓冲区并损坏堆内存。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2646

Vulnerability Information
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Vulnerability Title
Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞，该漏洞源于wolfSSL_d2i_SSL_SESSION函数存在堆缓冲区溢出，当反序列化启用了SESSION_CERTS的会话数据时，可能导致攻击者溢出固定大小的缓冲区并损坏堆内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfssl wolfssl 0 ~ 5.8.4 -

II. Public POCs for CVE-2026-2646

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III. Intelligence Information for CVE-2026-2646

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Patches & Fixes for CVE-2026-2646 (2)

Same Patch Batch · wolfssl · 2026-03-19 · 11 CVEs total

CVE-2026-3547 7.5 HIGH wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation
CVE-2026-0819 Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes
CVE-2026-1005 Integer underflow leads to out-of-bounds access in sniffer AES-GCM/CCM/ARIA-GCM decrypt pa
CVE-2026-2645 Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
CVE-2026-3548 Buffer overflow in CRL number parsing in wolfSSL
CVE-2026-3579 Non-constant time multiplication subroutine __muldi3 on RISC-V RV32I
CVE-2026-3580 Compiler-induced timing leak in sp_256_get_entry_256_9 on RISC-V
CVE-2026-4395 Heap-based buffer overflow in wc_ecc_import_x963_ex KCAPI path
CVE-2026-3230 Improper key_share validation in TLS 1.3 HelloRetryRequest
CVE-2026-4159 wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read

IV. Related Vulnerabilities

Same product: wolfssl
Same vendor: wolfssl
Same weakness: CWE-122

V. Comments for CVE-2026-2646

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