CVE-2026-123611
Public on 2026-11-08
Modified on 2026-11-12
Description
rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | amazon-efs-utils | Pending Fix | ||
| Amazon Linux 2023 | amazon-efs-utils | Pending Fix | ||
| Amazon Linux 2027 Preview | amazon-efs-utils | Pending Fix | ||
| Amazon Linux 2 - Aws-nitro-enclaves-cli Extra | aws-nitro-enclaves-cli | Pending Fix | ||
| Amazon Linux 2023 | aws-nitro-enclaves-cli | Pending Fix | ||
| Amazon Linux 2027 Preview | aws-nitro-enclaves-cli | Pending Fix | ||
| Amazon Linux 2023 | aws-workload-credentials-provider | Pending Fix | ||
| Amazon Linux 2023 | network-flow-monitor-agent | Pending Fix | ||
| Amazon Linux 2027 Preview | network-flow-monitor-agent | Pending Fix |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |