Github.com/cloudflare/circl: circl-fourq: missing and wrong validation can lead to incorrect results
Summary
| CVE | CVE-2025-8556 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-08-06 09:15:28 UTC |
| Updated | 2026-10-27 06:17:22 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 3.7 LOW from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Problem Types: CWE-1287 | CWE-1287 Improper Validation of Specified Type of Input
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 3.7 | LOW | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| 3.1 | CNA | CVSS | 3.7 | LOW | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
NoneAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implemen... | af854a3a-2127-422b-91ae-364da2661108 | www.botanica.software | |
| github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm | [email protected] | github.com | |
| access.redhat.com/security/cve/CVE-2025-8556 | [email protected] | access.redhat.com | |
| news.ycombinator.com/item | af854a3a-2127-422b-91ae-364da2661108 | news.ycombinator.com | |
| github.com/cloudflare/circl/tree/v1.6.1 | [email protected] | github.com | |
| github.com/cloudflare/circl | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2025-06-11T00:00:46.556Z | Reported to Red Hat. |
| CNA | 2025-06-10T21:18:33.000Z | Made public. |
Workarounds
CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
There are currently no legacy QID mappings associated with this CVE.