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Vulnerability · Published Feb 24, 2026 · Assigned by cloudflare

CVE-2026-1229Incorrect calculation in CIRCL secp384r1 CombinedMult

Low 2.9

In plain English

A low-severity security flaw in CIRCL from Cloudflare. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.9Low
Exploit odds (30 days)0.4%top 63.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24rclone1.73.5-r0ALPINE-CVE-2026-1229
Gogithub.com/cloudflare/circl1.6.3GO-2026-4550
Gogithub.com/cloudflare/circl1.6.3GHSA-q9hv-hpm4-hj6x
Ubuntu:22.04:LTSgolang-github-cloudflare-circlno fix listedUBUNTU-CVE-2026-1229
Ubuntu:24.04:LTSgolang-github-cloudflare-circlno fix listedUBUNTU-CVE-2026-1229
Ubuntu:25.10golang-github-cloudflare-circlno fix listedUBUNTU-CVE-2026-1229
Ubuntu:26.04:LTSgolang-github-cloudflare-circlno fix listedUBUNTU-CVE-2026-1229
Ubuntu:26.10golang-github-cloudflare-circlno fix listedUBUNTU-CVE-2026-1229

Affected products (as reported)

VendorProductVersions
Cloudflare CIRCL CIRCL up to version 1.6.2 – before 1.6.3

Weakness: CWE-682 · 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

References