CVE-2026-1229: CWE-682 Incorrect Calculation in Cloudflare CIRCL
CVE-2026-1229 is a low-severity vulnerability in the Cloudflare CIRCL library affecting the CombinedMult function in the ecc/p384 package for the secp384r1 curve. The function produces incorrect values for certain inputs due to incomplete addition formulas. This issue does not affect ECDH or ECDSA operations relying on this curve. The vulnerability was fixed in version 1.6.3 of CIRCL.
AI Analysis
Technical Summary
The vulnerability in Cloudflare's CIRCL library (CVE-2026-1229) involves the CombinedMult function within the ecc/p384 package implementing the secp384r1 elliptic curve. The function incorrectly calculates values for specific inputs because it does not use complete addition formulas. This flaw does not impact ECDH key exchange or ECDSA signing operations that rely on this curve. Cloudflare addressed the issue by updating the implementation to use complete addition formulas, and the fix was released in CIRCL version 1.6.3.
Potential Impact
The incorrect calculation in the CombinedMult function could lead to erroneous outputs when processing specific inputs with the secp384r1 curve. However, ECDH and ECDSA signing operations are not affected, limiting the potential impact. The CVSS score of 2.9 reflects a low severity, indicating limited risk and no known exploits in the wild.
Mitigation Recommendations
Users of the Cloudflare CIRCL library should upgrade to version 1.6.3 or later, where the issue is fixed by using complete addition formulas in the CombinedMult function. Applying this official fix eliminates the vulnerability. No additional mitigation steps are necessary as ECDH and ECDSA operations are unaffected.
CVE-2026-1229: CWE-682 Incorrect Calculation in Cloudflare CIRCL
Description
CVE-2026-1229 is a low-severity vulnerability in the Cloudflare CIRCL library affecting the CombinedMult function in the ecc/p384 package for the secp384r1 curve. The function produces incorrect values for certain inputs due to incomplete addition formulas. This issue does not affect ECDH or ECDSA operations relying on this curve. The vulnerability was fixed in version 1.6.3 of CIRCL.
CVSS v4.0
Score 2.9low
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Cloudflare's CIRCL library (CVE-2026-1229) involves the CombinedMult function within the ecc/p384 package implementing the secp384r1 elliptic curve. The function incorrectly calculates values for specific inputs because it does not use complete addition formulas. This flaw does not impact ECDH key exchange or ECDSA signing operations that rely on this curve. Cloudflare addressed the issue by updating the implementation to use complete addition formulas, and the fix was released in CIRCL version 1.6.3.
Potential Impact
The incorrect calculation in the CombinedMult function could lead to erroneous outputs when processing specific inputs with the secp384r1 curve. However, ECDH and ECDSA signing operations are not affected, limiting the potential impact. The CVSS score of 2.9 reflects a low severity, indicating limited risk and no known exploits in the wild.
Mitigation Recommendations
Users of the Cloudflare CIRCL library should upgrade to version 1.6.3 or later, where the issue is fixed by using complete addition formulas in the CombinedMult function. Applying this official fix eliminates the vulnerability. No additional mitigation steps are necessary as ECDH and ECDSA operations are unaffected.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cloudflare
- Date Reserved
- 2026-01-20T13:09:57.206Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 699e0f3fbe58cf853b290d94
Added to database: 02/24/2026, 20:51:11 UTC
Last enriched: 06/09/2026, 10:53:07 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 191
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