CVE-2026-123613: Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass
Fixed in 0.23.45 · Affected: rustls before 0.23.45 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 4% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- rustls · rustlsfrom 0.23.13 before 0.23.45
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- rustls
- Published
- November 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-123613 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.