GHSA-q9hv-hpm4-hj6x

ghsaUSosv

CIRCL has an incorrect calculation in secp384r1 CombinedMult

view advisory published 2026-02-25Licence: CC-BY-4.0

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)**.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-1229US	critical9.8	0.43% (36th)	—	2026-02-24
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. E…

references

External citations — patches, advisories, analysis.

https://github.com/cloudflare/circlPACKAGE
https://github.com/cloudflare/circl/pull/583WEB
https://github.com/cloudflare/circl/releases/tag/v1.6.3WEB
https://github.com/cloudflare/circl/security/advisories/GHSA-q9hv-hpm4-hj6xWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-1229ADVISORY

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