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CVE-2026-5066— net: sockets: tls: Potential out-of-bounds write/read in socket_op_vtable::connect function

Quick assessment

Affected
zephyrproject-rtos Zephyr
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.

Zephyr是Zephyr开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr存在安全漏洞，该漏洞源于TLS套接字连接路径中tls_session_store和tls_session_restore函数未验证addrlen值，导致memcpy越界写入，可能造成崩溃、拒绝服务或任意代码执行。

CVSS 6.3 · Medium EPSS 0.47% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject-rtos Zephyr *≤ 4.3 affected
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I. Basic Information for CVE-2026-5066

Vulnerability Information
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Vulnerability Title
net: sockets: tls: Potential out-of-bounds write/read in socket_op_vtable::connect function
Source: CVE Program / CVE List V5
Vulnerability Description
A potential out-of-bounds write/read exists in the TLS socket connect path of the network sockets subsystem (subsys/net/lib/sockets/sockets_tls.c). When the TLS session cache is enabled, tls_session_store() and tls_session_restore() memcpy the caller-supplied address into a fixed-size buffer using the caller-controlled addrlen value without validating it against the destination size. struct net_sockaddr is an opaque type, so an application can pass an addrlen larger than sizeof(struct net_sockaddr) (for example 128 bytes into a 24-byte stack buffer), causing the memcpy to read and write past the end of the address memory used by the TLS session cache. This out-of-bounds write can lead to a crash and denial of service, and potentially to arbitrary code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr存在安全漏洞，该漏洞源于TLS套接字连接路径中tls_session_store和tls_session_restore函数未验证addrlen值，导致memcpy越界写入，可能造成崩溃、拒绝服务或任意代码执行。
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
zephyrproject-rtos Zephyr * ~ 4.3 -

II. Public POCs for CVE-2026-5066

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III. Intelligence Information for CVE-2026-5066

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Vendor Advisories for CVE-2026-5066 (1)

IV. Related Vulnerabilities

Same product: Zephyr
Same vendor: zephyrproject-rtos
Same weakness: CWE-787

V. Comments for CVE-2026-5066

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