The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas.
ECDH and ECDSA signing relying on this curve are not affected.

The bug was fixed in v1.6.3 https://github.com/cloudflare/circl/releases/tag/v1.6.3 .

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00013.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cloudflare CIRCL unaffected
Version Status Constraints
CIRCL up to version 1.6.2 affected < 1.6.3

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cloudflare/circl cve-icon cve-icon
History

Tue, 24 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 24 Feb 2026 08:15:00 +0000

Type Values Removed Values Added
Description The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas. ECDH and ECDSA signing relying on this curve are not affected. The bug was fixed in v1.6.3 https://github.com/cloudflare/circl/releases/tag/v1.6.3 .
Title Incorrect calculation in CIRCL secp384r1 CombinedMult
Weaknesses CWE-682
References
Metrics cvssV4_0

{'score': 2.9, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/U:Amber'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cloudflare

Published:

Updated: 2026-02-24T15:10:21.738Z

Reserved: 2026-01-20T13:09:57.206Z

Link: CVE-2026-1229

cve-icon Vulnrichment

Updated: 2026-02-24T15:06:03.406Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-24T08:16:28.407

Modified: 2026-02-24T14:13:49.320

Link: CVE-2026-1229

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses