Vulnerabilities in pkg:golang/github.com/cloudflare/circl

PACKAGE
Advisory Identifier: GHSA-q9hv-hpm4-hj6x
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Advisory Summary

CVE-2026-1229 is a LOW circl has an incorrect calculation vulnerability (CWE-682: Incorrect Calculation) affecting Github.com/cloudflare/circl libraries in the Go ecosystem. The issue involves circl has an incorrect calculation in secp384r1 combinedmult. Remediation is available by upgrading affected packages to version 1.6.3.

5 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/cloudflare/circl

5 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/cloudflare/circl. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-q9hv-hpm4-hj6x CVE-2026-1229 LOW CIRCL has an incorrect calculation in secp384r1 CombinedMult
GHSA-2x5j-vhc8-9cwm CVE-2025-8556 LOW CIRCL-Fourq: Missing and wrong validation can lead to incorrect results
GHSA-522r-9946-fw43 - LOW Duplicate Advisory: CIRCL-Fourq: Missing and wrong validation can lead to incorrect results
GHSA-9763-4f94-gfch - HIGH CIRCL's Kyber: timing side-channel (kyberslash2)
GHSA-2q89-485c-9j2x CVE-2023-1732 MODERATE Improper random reading in CIRCL

CVE-2026-1229 at a Glance

CVE Identifier CVE-2026-1229
GHSA Identifier GHSA-q9hv-hpm4-hj6x
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-682: Incorrect Calculation
Affected Product Github.com/cloudflare/circl
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-1229

To remediate this vulnerability, upgrade all affected Github.com/cloudflare/circl dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/cloudflare/circl fixed: 1.6.3 
Upgrade github.com/cloudflare/circl to 1.6.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/cloudflare/circl

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-1229, inspect your project dependencies for Github.com/cloudflare/circl:

inspect dependencies for github.com/cloudflare/circl

Analyze the terminal output to locate any version of Github.com/cloudflare/circl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-682: Incorrect Calculation, where the product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. In Github.com/cloudflare/circl, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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)**.

CVE-2026-1229 Affected Github.com/cloudflare/circl Versions

1 component(s)
Fixed Versions:
1.6.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/cloudflare/circl
golang/github.com/cloudflare/circl
Go
< 1.6.3
1.6.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cloudflare/circl/security/advisories/GHSA-q9hv-hpm4-hj6x
NVD — CVE-2026-1229 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1229
Github.com/cloudflare/circl Source Repository REPOSITORY
https://github.com/cloudflare/circl/pull/583
Github.com/cloudflare/circl Source Repository REPOSITORY
https://github.com/cloudflare/circl
Github.com/cloudflare/circl Release RELEASE
https://github.com/cloudflare/circl/releases/tag/v1.6.3

Frequently Asked Questions

What is CVE-2026-1229?
CVE-2026-1229 is a security vulnerability in Github.com/cloudflare/circl involving CIRCL has an incorrect calculation in secp384r1 CombinedMult under CWE-682: Incorrect Calculation.
Which Github.com/cloudflare/circl versions are affected?
Affected versions include releases prior to 1.6.3 across affected packages: github.com/cloudflare/circl.
What version fixes CVE-2026-1229?
Upgrading to 1.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/cloudflare/circl affected?
Yes, github.com/cloudflare/circl is affected in releases prior to 1.6.3. Upgrade your dependency to 1.6.3 or later.
What CWE is associated with CVE-2026-1229?
CVE-2026-1229 is classified under CWE-682: Incorrect Calculation (The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.).
How can I check Go dependencies for CVE-2026-1229?
Run the dependency tree command: 'inspect dependencies for github.com/cloudflare/circl'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q9hv-hpm4-hj6x",
  "modified" : "2026-02-25T19:17:50Z",
  "published" : "2026-02-25T19:17:50Z",
  "aliases" : [ "CVE-2026-1229" ],
  "summary" : "CIRCL has an incorrect calculation in secp384r1 CombinedMult",
  "details" : "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.\nECDH and ECDSA signing relying on this curve are not affected.\n\nThe bug was fixed in **[v1.6.3](https://github.com/cloudflare/circl/releases/tag/v1.6.3)**.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cloudflare/circl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/circl/security/advisories/GHSA-q9hv-hpm4-hj6x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-1229"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/circl/pull/583"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cloudflare/circl"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/circl/releases/tag/v1.6.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-682" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-25T19:17:50Z",
    "nvd_published_at" : "2026-02-24T08:16:28Z"
  }
}