Detections
Analytics
CVE-2026-87866
critical
Description
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.
References
https://hackerone.com/reports/3989514
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105314