CVE-2026-97031
Reject malformed ECH outer extension references in crypto/tls
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 8, 2026
- Updated
- Oct 9, 2026
- Reserved
- Sep 23, 2026
Description
Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-405 Asymmetric Resource Consumption (Amplification)
Affected Products
| Product | Versions |
|---|---|
crypto/tlsGo standard library |
|
References
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