RUSTSEC-2026-0285: TLS 1.3 handshake messages incorrectly accepted across encryption level boundaries
Nobody has claimed this yet.
Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 68/100
Research direction
Read the linked Rustls advisory and locate where rustls 0.23.42 is declared in the repository. Update it to a patched version at or above 0.23.45, then run the repository's Rust checks to confirm the dependency resolves and existing tests pass.
Written by the indexing model from the issue text.
Description
TLS 1.3 handshake messages incorrectly accepted across encryption level boundaries
| Details | |
|---|---|
| Package | rustls |
| Version | 0.23.42 |
| 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.
- Dominant language
- Rust
- Stars
- 10
- Forks
- 5
- Avg merge
- 4h 41m
- Merged PRs (30d)
- 4
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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