CVE-2026-86409

Description

Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL isset next, leaking state information.

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Produits concernés

• curl

Références

• https://curl.se/docs/CVE-2026-86409.html
• https://curl.se/docs/CVE-2026-86409.json
• https://hackerone.com/reports/3973135

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories