[ CVE-2026-87866 · Published 20 Oct 2026 ]
Vulnerability in curl
[ Description ]Official 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.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1307
Multiple vulnerabilities in Curl Translated from French
Multiple vulnerabilities have been discovered in Curl. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.
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BSI CERT-BundWID-SEC-2026-3904
cURL: Multiple vulnerabilities Translated from German