CVE-2026-1229

Incorrect calculation in CIRCL secp384r1 CombinedMult

Published Feb 24, 2026 CVSS 4.0 · 2.9 Low EPSS < 1% KEV · Not listed
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 .

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-q9hv-hpm4-hj6x CIRCL has an incorrect calculation in secp384r1 CombinedMult
References
History
Type Values Removed Values Added
CPEs cpe:2.3:a:cloudflare:circl:*:*:*:*:*:go:*:*
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
First Time appeared Cloudflare
Cloudflare circl
Vendors & Products Cloudflare
Cloudflare circl
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cloudflare
Published
Updated
Feb 24, 2026, 3:10 PM
Reserved
Jan 20, 2026, 1:09 PM
Status
Analyzed
Published
Feb 24, 2026, 8:16 AM
Modified
Jun 17, 2026, 10:15 AM