CVE-2026-15711
Estado: AplazadaAlta (7.5)—
A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.74%
- Percentil entre todas las CVEs puntuadas: 53
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access90 % - Impacto principal
T1499.004Application or System Exploitationimpact85 %
Fallo en validación de protocolo WebSocket en libsoup explotable remotamente sin autenticación (AV:N/PR:N/UI:N) causando crash interno y denegación de servicio por consumo de recursos.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-770
Referencias
- https://access.redhat.com/errata/RHSA-2026:68234
- https://access.redhat.com/errata/RHSA-2026:68235
- https://access.redhat.com/errata/RHSA-2026:68266
- https://access.redhat.com/errata/RHSA-2026:68612
- https://access.redhat.com/errata/RHSA-2026:69108
- https://access.redhat.com/errata/RHSA-2026:69297
- https://access.redhat.com/errata/RHSA-2026:69863
- https://access.redhat.com/errata/RHSA-2026:70598
- https://access.redhat.com/errata/RHSA-2026:70599
- https://access.redhat.com/errata/RHSA-2026:71389
- https://access.redhat.com/security/cve/CVE-2026-15711
- https://bugzilla.redhat.com/show_bug.cgi?id=2499924
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/515
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/515
JSON original (NVD)
Mostrar
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"value": "A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets."
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