CVE-2026-1229— Incorrect calculation in CIRCL secp384r1 CombinedMult
Quick assessment
Affected
Cloudflare CIRCL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
CIRCL是Cloudflare开源的一个用 Go 编写的加密原语集合。 CIRCL存在安全漏洞，该漏洞源于CombinedMult函数对特定输入产生错误值，可能导致计算错误。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-1229
Vulnerability Information
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Vulnerability Title
Incorrect calculation in CIRCL secp384r1 CombinedMult
Source: CVE Program / CVE List V5
Vulnerability 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 .
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
CIRCL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CIRCL是Cloudflare开源的一个用 Go 编写的加密原语集合。 CIRCL存在安全漏洞，该漏洞源于CombinedMult函数对特定输入产生错误值，可能导致计算错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Cloudflare | CIRCL | CIRCL up to version 1.6.2 ~ 1.6.3 | - |
|
II. Public POCs for CVE-2026-1229
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2026-1229
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