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CVE-2026-102182 – Unauthenticated RCE (Stack-Based Buffer Overflow in kmd) – Junos OS on MX Series (

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Summary

CVE-2026-102182 is a stack-based buffer overflow in the kmd component of Juniper Networks Junos OS on MX Series devices. An unauthenticated network attacker can execute code as root by sending specific IKE certificate-based packets. The CVSS v3.1 base score is 9.8 (Critical).

Technical details

  • Root cause: stack-based buffer overflow in the kmd component of Junos OS.
  • Trigger conditions: specific IKE certificate-based packets sent to an affected MX Series device.
  • Attack vector: network, with no authentication and no user interaction required.
  • Impact: remote code execution as root.

Affected software

Junos OS on MX Series:

  • All versions before 23.2R2-S7.7
  • 23.4 versions before 23.4R2-S8.13
  • 24.2 versions before 24.2R2-S5.5
  • 24.4 versions before 24.4R2-S5
  • 25.2 versions before 25.2R2-S2
  • 25.4 versions before 25.4R1-S3
  • 26.2 versions before 26.2R1-S2

Severity

CVSS v3.1 base score: 9.8 (Critical), network attack vector, low attack complexity, no privileges required. The CVE record also lists a CVSS v4.0 score of 9.3 (Critical). The full vector string was not retrievable from the sources reviewed; see the vendor advisory JSA112196 for details.

Mitigation and recommended actions

  • Immediate: upgrade to a fixed release: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, or any later release.
  • Juniper states there are no known workarounds for this issue.

References

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