RUSTSEC-2026-0285: TLS 1.3 handshake messages incorrectly accepted across encryption level boundaries
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调研方向
Start by locating where this repository pins or depends on rustls; no specific file or test is named in the issue. Update the dependency to a patched version at or above 0.23.45, then verify the project’s existing checks and confirm that the vulnerable 0.23.43 version is no longer used.
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描述
TLS 1.3 handshake messages incorrectly accepted across encryption level boundaries
| Details | |
|---|---|
| Package | rustls |
| Version | 0.23.43 |
| URL | https://github.com/rustls/rustls/security/advisories/GHSA-2mjx-qc3c-rqvc |
| Date | 2026-09-14 |
| Patched versions | >=0.23.45 |
| Unaffected versions | <0.23.13 |
Rustls accepted TLS 1.3 handshake messages sent at the wrong encryption level
when they followed a key-changing message in the same record. For example,
a plaintext EncryptedExtensions message packed into the same record as the
ServerHello was accepted.
RFC 8446 section 5.1 requires that handshake messages do not span key changes,
and that implementations terminate the connection with an "unexpected_message"
alert if they do.
The handshake transcript is still authenticated, so a network-position attacker
cannot use this to alter or complete a handshake; the practical effect is that
a peer could send handshake messages that should be encrypted in plaintext
without rustls rejecting the connection.
This is functionally the same bug as Go's
GO-2026-4340 (CVE-2025-61730).
See advisory page for additional details.
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