---
id: CVE-2026-101302
title: >-
  TLS 1.3 embeds the actual record type as the last non-zero byte of the
  decrypted payload, optionally followed by zero padding
summary: >-
  TLS 1.3 embeds the actual record type as the last non-zero byte of the
  decrypted payload, optionally followed by zero padding.  The code which
  searches for the inner record type had an off-by-one bug which could be
  triggered by an invali…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-193
  - CWE-476
vendor: FreeBSD
product: FreeBSD
affected:
  - FreeBSD >= 15.1-RELEASE < p4
  - FreeBSD >= 15.0-RELEASE < p14
  - FreeBSD >= 14.5-RELEASE < p1
  - FreeBSD >= 14.4-RELEASE < p10
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:17:41.437'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101302'
references:
  - url: 'https://security.freebsd.org/advisories/FreeBSD-SA-26:67.ktls.asc'
    label: secteam@freebsd.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T13:54:51.888489Z'
ingestedAt: '2026-10-15T07:57:27.842Z'
epss: 0.0024
epssPercentile: 0.15009
---

## Overview

TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed by zero padding.  The code which searches for the inner record type had an off-by-one bug which could be triggered by an invalid frame, leading to an underflow followed by an unconditional NULL pointer dereference, causing a kernel panic.

A remote TLS 1.3 peer can send a specially crafted record to trigger a kernel panic, resulting in a Denial of Service (DoS).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.