CVE Watch20 oct 2026

CVE-2026-87866

When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer does not possess. During the TLS

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 20 oct 2026 · Última mod.: 20 oct 2026

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer does not possess. During the TLS handshake, wolfSSL validates the connection, but curl's subsequent re-parsing of the same certificate - tricked by a manipulated validity length field - extracts and matches a different embedded key, incorrectly authorizing the pinned public key.

Referencias oficiales

curl.sehttps://curl.se/docs/CVE-2026-87866.html
curl.sehttps://curl.se/docs/CVE-2026-87866.json
hackerone.comhttps://hackerone.com/reports/3989514

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