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CVE-2026-77358— cpp-httplib: Use-after-free of TLS session in WebSocketClient::shutdown_and_close()

Quick assessment

Affected
yhirose cpp-httplib
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.

cpp-httplib 是一个仅包含头文件的 C++ HTTP/HTTPS 库。在 0.33.0 至 0.50.0 版本中，启用 TLS 的 WebSocket 客户端在关闭仍在使用 TLS 会话的 WebSocket 连接之前，先释放了该 TLS 会话，从而导致了“释放后使用”（use-after-free）缺陷。 在 中，SSL 对象被释放且其指针被置空，但随后的 WebSocket 关闭操作仍会通过 SSL 套接字流发送关闭帧；该流内部持有一个已释放会话的裸指针副本，从而在已释放的内存上进行读写操作。这种“先

CVSS 8.2 · High EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1218 · System Binary Proxy Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
yhirose cpp-httplib >= 0.33.0, < 0.50. affected
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I. Basic Information for CVE-2026-77358

Vulnerability Information
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Vulnerability Title
cpp-httplib: Use-after-free of TLS session in WebSocketClient::shutdown_and_close()
Source: CVE Program / CVE List V5
Vulnerability Description
cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yhirose cpp-httplib >= 0.33.0, < 0.50. -

II. Public POCs for CVE-2026-77358

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III. Intelligence Information for CVE-2026-77358

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Patches & Fixes for CVE-2026-77358 (1)

Vendor Advisories for CVE-2026-77358 (1)

IV. Related Vulnerabilities

Same product: cpp-httplib
Same vendor: yhirose
Same weakness: CWE-416

V. Comments for CVE-2026-77358

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