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CVE-2025-8556

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Date: August 6, 2025

A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.

Severity Score

Severity Score

Weakness Type (CWE)

Improper Verification of Cryptographic Signature

CWE-347

Improper Input Validation

CWE-20

Top Fix

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Upgrade Version

Upgrade to version github.com/cloudflare/circl - v1.6.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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