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CVE-2026-123613

Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass

CVSS 4.0 6.9 MEDIUMCVSS 3.1 5.3 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 10 Nov 2026 19:21:22 UTC. Read the latest advisory.

cve-program · CVE-2026-123613

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-123613

Published

Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass

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.

Source published
8 Nov 2026 01:38:37 UTC
Source modified
10 Nov 2026 17:56:44 UTC
Saved here
10 Nov 2026 19:21:22 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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Sources read 15 Nov 21:13 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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