CVE-2026-26076

ntpd-rs affected by excessive CPU load from malformed packets

6.9 MediumFix available

ntpd-rs is a full-featured implementation of the Network Time Protocol. Prior to 1.7.1, an attacker can remotely induce moderate increases (2-4 times above normal) in cpu usage. When having NTS enabled on an ntpd-rs server, an attacker can create malformed NTS packets that take significantly more effort for the server to respond to by requesting a large number of cookies. This can lead to degraded server performance even when a server could otherwise handle the load. This vulnerability is fixed in 1.7.1.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.41%Up 0.4 points since Feb 13, 2026

What each source reports

CVE List Score used 6.9

ntpd-rs affected by excessive CPU load from malformed packets

Record: CVE-2026-26076
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-770
Updated: 2026-11-02

EUVDEUVD-2026-6163 6.9

Record: EUVD-2026-6163
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-26076
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-770
Updated: 2026-11-02

OSV 6.9

ntpd-rs affected by excessive CPU load from malformed packets

Record: CVE-2026-26076
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-770
Updated: 2026-11-04

OSVDEBIAN-CVE-2026-26076 7.5

Record: DEBIAN-CVE-2026-26076
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-26076 6.9

Record: UBUNTU-CVE-2026-26076
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`rust-ntp-proto` Debian:13	before 1.4.0-4+deb13u1, plus listed versions 1.4.0-4	1.4.0-4+deb13u1
`rust-ntp-proto` Debian:14	before 1.7.1-1, plus listed versions 1.4.0-41.6.0-11.6.2-11.6.2-21.6.2-31.6.2-4	1.7.1-1
`rust-ntpd` Ubuntu:24.04:LTS	All versions, plus listed versions 1.0.0-51.1.0-21.1.0-31.1.1-11.1.1-21.1.2-1	None known
`rust-ntpd` Ubuntu:25.10	All versions, plus listed versions 1.1.3-1build11.4.0-6	None known
`rust-ntpd` Ubuntu:26.10	All versions, plus listed versions 1.7.1-11.7.2-11.7.2-21.9.0-0ubuntu11.9.0-0ubuntu2	None known
`rust-ntpd` Ubuntu:26.04:LTS	All versions, plus listed versions 1.4.0-61.6.2-21.6.2-31.6.2-41.7.1-1	None known

History

History
Recorded	Changed	Sources
Nov 4, 2026	facts	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-26076 is a medium vulnerability (CVSS 6.9) in Pendulum-project Ntpd-rs, published February 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 34th percentile. Fixed in rust-ntp-proto 1.4.0-4+deb13u1.