Improper Input Validation Affecting rust-rustls package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.16% (5th percentile)

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  • Snyk IDSNYK-DEBIAN12-RUSTRUSTLS-22345603
  • published8 Nov 2026
  • disclosed8 Nov 2026

Introduced: 8 Nov 2026

NewCVE-2026-123613  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 rust-rustls.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-rustls package and not the rust-rustls package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1