CVE-2026-50161

libre is a generic library for real-time communications with asynchronous input and output support. Prior to 4.8.1, the websock_decode() function in src/websock/websock.c contains an integer overflow when validating a masked WebSocket frame that uses the 64-bit extended length encoding. The expression 4 + hdr->len can wrap when hdr->len is close to UINT64_MAX, causing the mbuf_get_left() bounds check to pass. The subsequent XOR unmasking loop then writes beyond the heap buffer. Applications using websock_accept() or websock_accept_proto() to implement a WebSocket server are affected, and exploitation can cause attacker-controlled heap corruption or denial of service after the HTTP WebSocket upgrade handshake. This issue is fixed in version 4.8.1.

CVSS

No CVSS.

References

Link	Resource
https://github.com/baresip/re/commit/718b92615c7963670d26c1a2b246968b58d782e8
https://github.com/baresip/re/pull/1584
https://github.com/baresip/re/releases/tag/v4.8.1
https://github.com/baresip/re/security/advisories/GHSA-hvxv-v2gp-v93h

Configurations

No configuration.

History

22 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) libre es una biblioteca genérica para comunicaciones en tiempo real con soporte de entrada y salida asíncrona. Antes de la 4.8.1, la función websock_decode() en src/websock/websock.c contiene un desbordamiento de entero al validar una trama WebSocket enmascarada que utiliza la codificación de longitud extendida de 64 bits. La expresión 4 + hdr -> len puede desbordarse cuando hdr -> len está cerca de UINT64_MAX, haciendo que la comprobación de límites de mbuf_get_left() pase. El bucle de desenmascaramiento XOR subsiguiente luego escribe más allá del búfer de montón. Las aplicaciones que utilizan websock_accept() o websock_accept_proto() para implementar un servidor WebSocket se ven afectadas, y la explotación puede causar corrupción de montón controlada por el atacante o denegación de servicio después del handshake de actualización HTTP WebSocket. Este problema está corregido en la versión 4.8.1.

Information

Published : 2026-08-18 18:17

Updated : 2026-10-22 22:10

NVD link : CVE-2026-50161

Mitre link : CVE-2026-50161

CVE.ORG link : CVE-2026-50161

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

CWE-787

Out-of-bounds Write

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