CVE-2025-8556

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.

References

https://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation

https://news.ycombinator.com/item?id=45669593

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

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

https://github.com/cloudflare/circl

https://bugzilla.redhat.com/show_bug.cgi?id=2371624

https://access.redhat.com/security/cve/CVE-2025-8556

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS