Is github.com/cloudflare/circl affected by CVE-2026-1229?

Go github.com/cloudflare/circl is affected in <1.6.3.

Is CVE-2026-1229 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

medium

CVE-2026-1229

Q: Is CVE-2026-1229 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

Go · github.com/cloudflare/circl

Summary

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

Severity: medium
EPSS: 0.4% (p31)
Also known as: GHSA-q9hv-hpm4-hj6x, GO-2026-4550
Published: 2026-02-27

References

https://github.com/cloudflare/circl/security/advisories/GHSA-q9hv-hpm4-hj6x
https://nvd.nist.gov/vuln/detail/CVE-2026-1229
https://github.com/cloudflare/circl/pull/583

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.