Rustls from 0.23.13 before 0.23.45 accepts TLS 1.3 handshake messages at the wrong encryption level when they follow a key-changing message in the same record, because Deframer::aligned does not enforce RFC 8446 record-boundary alignment. A peer or on-path attacker can pack a plaintext EncryptedExtensions with the ServerHello, which rustls accepts unencrypted.
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References
History
Sun, 08 Nov 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Rustls from 0.23.13 before 0.23.45 accepts TLS 1.3 handshake messages at the wrong encryption level when they follow a key-changing message in the same record, because Deframer::aligned does not enforce RFC 8446 record-boundary alignment. A peer or on-path attacker can pack a plaintext EncryptedExtensions with the ServerHello, which rustls accepts unencrypted. | |
| Title | Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass | |
| First Time appeared |
Rustls Project
Rustls Project rustls |
|
| Weaknesses | CWE-20 | |
| CPEs | cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Rustls Project
Rustls Project rustls |
|
| References |
| |
| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-08T01:38:37.574Z
Reserved: 2026-11-06T01:02:39.794Z
Link: CVE-2026-123613
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Weaknesses