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TI-2026-21080 Aliases CVE-2026-26076

ntpd-rs affected by excessive CPU load from malformed packets

Priority LOW 37CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00406 35th percentileScored 2026-11-07
Fix Fixed ntpd-rs (pendulum-project): 1.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pendulum-projectntpd-rsbefore 1.7.11.7.1Patch availableCNA
  • ntpd-rs Vendorpendulum-project Affected before 1.7.1 Fixed in 1.7.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tweedegolf:ntpd-rs:*:*:*:*:*:rust:*:*before 1.7.1VulnerableTweedegolf
  • cpe:2.3:a:tweedegolf:ntpd-rs:*:*:*:*:*:rust:*:* Versions before 1.7.1 Vulnerable ·Tweedegolf

Remediation

  • Fix · CNA ntpd-rs (pendulum-project) Fixed in 1.7.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26076
  2. 2026-10-11 EPSS moved to the 50th–90th percentile
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 1

Advisory 1

Other 1

  • TI-2024-25763 Unlimited number of NTS-KE connections can crash ntpd-rs server CVSS 3.1HIGH 7.5
  • TI-2025-35909 DoS Vulnerability in ntpd-rs CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences