CVE-2026-101302: TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed

Routine

MEDIUM 6.5MITIGATE

CVE-2026-101302 is a medium-severity flaw (CVSS 6.5) affecting freebsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-193, CWE-476
Published	2026-10-15
Last modified	2026-10-20

Publisher (CNA): FreeBSD · Vendor: freebsd

Last updated 2026-10-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-15 07:17 UTCPublished CVE record published
2026-10-20 00:16 UTCUpdated Record last modified

freebsd freebsd MITIGATE

Affected: 14.4 · 14.4 p1 · 14.4 p2 · 14.4 p3 · 14.4 p4 · 14.4 p5 · 14.4 p6 · 14.4 p7

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.4

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-101302?

freebsd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-101302 being exploited?

CVE-2026-101302 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-101302 affect?

CVE-2026-101302 affects freebsd. Severity is medium (CVSS 6.5). 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 f

How urgent is CVE-2026-101302?

Priority 26/100. No elevated risk signals yet.

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References

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