curl: SSL session-cache peer key omits signature_algorithms: strict-sigalg handle silently resumes a permissive sibling's session

🗓️ 16 May 2026 02:59:17Reported by hexproofType

hackerone

hackerone🔗 hackerone.com👁 12 Views

SSL signature algorithms mismatch in session cache enables cross-policy resume in curl 8.14.0–8.20.0.

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19 May 2026 13:53Current

6.7Medium risk

Vulners AI Score6.7

CVSS 25

CVSS 3.17.5

EPSS0.00159

signature algorithms session cache curl vulnerability policy mismatch openssl compatibility