CVEvulnerability
CVE-2026-87866
- Status
- Awaiting Analysis
- Published
- 2026-10-20
- Last modified
- 2026-10-22
- Assigner
- 2499f714-1537-4658-8207-48ae4bb9eae9
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://curl.se/docs/CVE-2026-87866.html curl.se
- https://curl.se/docs/CVE-2026-87866.json curl.se
- https://hackerone.com/reports/3989514 hackerone.com