# CVE-2026-1229: GO-2026-4550 - CIRCL has an incorrect calculation in secp384r1 CombinedMult in github.com/cloudflare/circl

Source: https://junglewise.ai/threats/cve-2026-1229-circl-has-an-incorrect-calculation-in-secp384r1-combinedmult  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-27  
License: CC BY 4.0 with a link back

CVE-2026-1229 · Severity: medium · CVSS 4 · Published 2026-02-27

CIRCL has an incorrect calculation in secp384r1 CombinedMult in github.com/cloudflare/circl

Technologies: [github.com/cloudflare/circl (Go)](https://junglewise.ai/threats/technologies/github-com-cloudflare-circl). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-1229 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-1229 being exploited in the wild.

**How severe is CVE-2026-1229?** Medium severity, with a CVSS score of 4, published 27 February 2026.

**Which products and versions are affected?** github.com/cloudflare/circl (Go) SEMVER:introduced=0,fixed=1.6.3.

**Is there a fix for CVE-2026-1229?** Yes. github.com/cloudflare/circl (Go): upgrade to 1.6.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-1229?** Check whether you run github.com/cloudflare/circl (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/cloudflare/circl (Go): upgrade to 1.6.3 or later

  ```sh
  go get github.com/cloudflare/circl@v1.6.3
  ```


## Affected products

- github.com/cloudflare/circl (Go) SEMVER:introduced=0,fixed=1.6.3

## Identifiers

- CVE-2026-1229
- GHSA-q9hv-hpm4-hj6x
- GO-2026-4550

## Related threats

- [Duplicate Advisory: CIRCL-Fourq: Missing and wrong validation can lead to incorrect results](https://junglewise.ai/threats/duplicate-advisory-circl-fourq-missing-and-wrong-validation-can-lead-to-df43a87c)
- [GO-2025-3754 - CIRCL-Fourq: Missing and wrong validation can lead to incorrect results in github.com/cloudflare/circl](https://junglewise.ai/threats/cve-2025-8556-circl-fourq-missing-and-wrong-validation-can-lead-to-incorrect)
- [GO-2024-2453 - Timing side channel in github.com/cloudflare/circl](https://junglewise.ai/threats/go-2024-2453-timing-side-channel-in-github-com-cloudflare-circl-86e2bcc1)
- [CIRCL's Kyber: timing side-channel (kyberslash2)](https://junglewise.ai/threats/circl-s-kyber-timing-side-channel-kyberslash2-9a5b4be8)
- [GO-2023-1765 - Leaked shared secret and weak blinding in github.com/cloudflare/circl](https://junglewise.ai/threats/cve-2023-1732-improper-random-reading-in-circl)