CVE-2026-55958— Renesas TSIP TLS 1.3 transcript buffer out-of-bounds write in tsip_StoreMessage

Renesas TSIP TLS 1.3 transcript buffer out-of-bounds write in tsip_StoreMessage

Out-of-bounds write in the Renesas TSIP TLS 1.3 transcript buffer. In tsip_StoreMessage() the capacity check guarding the fixed message bag (MSGBAG_SIZE) sets an error code but fails to return, so execution falls through to an XMEMCPY that writes past the end of the buffer once the accumulated TLS 1.3 handshake transcript exceeds MSGBAG_SIZE (8 KB), corrupting adjacent heap state and potentially causing a remote denial of service crash. The bag is sized to hold a normal handshake, so this is reached only by an unusually large but valid certificate chain, or by a malicious or man-in-the-middle server sending an oversized handshake message to a client that does not strictly verify the chain. This only affects builds using the Renesas TSIP TLS port (WOLFSSL_RENESAS_TSIP_TLS) as a TLS 1.3 client on Renesas MCUs with TSIP hardware enabled, and is rated High within those builds. All other configurations are unaffected.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

跨界内存写

wolfSSL 异常处理不当漏洞

wolfSSL是wolfSSL公司开源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 5.4.0版本至5.9.1及之前版本存在安全漏洞，该漏洞源于Renesas TSIP TLS 1.3记录缓冲区边界写入检查失败，可能导致越界写入和远程拒绝服务崩溃。

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