---
title: "CVE-2026-102486: NTPsec ntpd - Denial of Service"
description: "NTPsec ntpd 1.1.4 through 1.2.5 contains an out-of-bounds read caused by improper parsing of NTS Authenticator and Encrypted Extension Fields with oversized nonce length, letting remote attackers crash the daemon, exploit requires crafted NTS AEEF field."
url: https://panop.io/threat-heartbeat/CVE-2026-102486/
---

# CVE-2026-102486 NTPsec ntpd - Denial of Service

NTPsec ntpd 1.1.4 through 1.2.5 contains an out-of-bounds read caused by improper parsing of NTS Authenticator and Encrypted Extension Fields with oversized nonce length, letting remote attackers crash the daemon, exploit requires crafted NTS AEEF field.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102486)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

21 October 2026

Updated

22 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to a version later than 1.2.5 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-102486](https://nvd.nist.gov/vuln/detail/CVE-2026-102486)
- [https://gitlab.com/NTPsec/ntpsec/-/commit/7cc079387](https://gitlab.com/NTPsec/ntpsec/-/commit/7cc079387)
- [https://gitlab.com/NTPsec/ntpsec/-/work\_items/891](https://gitlab.com/NTPsec/ntpsec/-/work_items/891)
- [https://gitlab.com/NTPsec/ntpsec/-/work\_items/895](https://gitlab.com/NTPsec/ntpsec/-/work_items/895)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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