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Description

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.

PUBLISHED Reserved 2025-08-04 | Published 2025-08-06 | Updated 2026-02-25 | Assigner redhat




LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

Improper Validation of Specified Type of Input

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Timeline

2025-06-11:Reported to Red Hat.
2025-06-10:Made public.

References

www.botanica.software/...udflares-circl-fourq-implementation

news.ycombinator.com/item?id=45669593

access.redhat.com/security/cve/CVE-2025-8556 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2371624 (RHBZ#2371624) issue-tracking

github.com/cloudflare/circl

github.com/.../circl/security/advisories/GHSA-2x5j-vhc8-9cwm

github.com/cloudflare/circl/tree/v1.6.1

cve.org (CVE-2025-8556)

nvd.nist.gov (CVE-2025-8556)

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