# CVE-2026-1229: Incorrect calculation in CIRCL secp384r1 CombinedMult

> CVE-2026-1229: Incorrect calculation in CIRCL secp384r1 CombinedMult. CVSS 9.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-1229
Last updated: 2026-06-17T10:15:21Z

- Published: 2026-02-24 07:58 UTC · Updated: 2026-06-17 10:15 UTC · Assigner: cloudflare
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.43%, 37th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-682

## 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 .

## Affected vendors and products

- Cloudflare: CIRCL

## Tracked companies

- [Cloudflare](https://rewindex.com/company/cloudflare.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-1229)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-1229)
- [https://github.com/cloudflare/circl](https://github.com/cloudflare/circl)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-1229 · Markdown: https://rewindex.com/cve/CVE-2026-1229.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-1229 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:28.084Z