Incorrect calculation in CIRCL secp384r1 CombinedMult
Priority LOW 15CWE-682Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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 .
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00426 37th percentileScored 2026-11-07
Fix Fixed CIRCL (Cloudflare): 1.6.3github.com/cloudflare/circl (Go): 1.6.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cloudflare | CIRCL | CIRCL up to version 1.6.2 to before 1.6.3 | 1.6.3 | Patch available | CNA |
| — | github.com/cloudflare/circl (Go) | before 1.6.3 | 1.6.3 | Patch available | GHSA-q9hv-hpm4-hj6x |
- CIRCL VendorCloudflare Affected CIRCL up to version 1.6.2 to before 1.6.3 Fixed in 1.6.3 Patch available CNA
- github.com/cloudflare/circl (Go) Vendor— Affected before 1.6.3 Fixed in 1.6.3 Patch available GHSA-q9hv-hpm4-hj6x
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudflare:circl:*:*:*:*:*:go:*:* | before 1.6.3 | Vulnerable | Cloudflare |
- cpe:2.3:a:cloudflare:circl:*:*:*:*:*:go:*:* Versions before 1.6.3 Vulnerable ·Cloudflare
Remediation
- Fix · CNA CIRCL (Cloudflare) Fixed in 1.6.3
- Fix · GHSA-q9hv-hpm4-hj6x github.com/cloudflare/circl (Go) Fixed in 1.6.3 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1229
- 2026-10-03 Alias added: GHSA-q9hv-hpm4-hj6x
References
More Cloudflare Circl vulnerabilities
- TI-2023-01625 Improper random reading in CIRCL CVSS 3.1HIGH 8.2
Sources
- CVE-2026-1229 · CVE Program
- CVE-2026-1229 · NVD
- FIRST EPSS
- GHSA-q9hv-hpm4-hj6x · GitHub Advisory Database · CC BY 4.0
- CVE-2026-1229 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences