CVE-2026-101985 Juniper Networks CVE debrief

Who should care

Network administrators responsible for Junos OS Evolved on PTX Series should assess exposure and prioritize patching or mitigating this vulnerability to prevent potential denial-of-service attacks.

Why it matters

CVE-2026-101985 is a denial-of-service vulnerability in Junos OS Evolved on PTX Series that requires patching or mitigation to prevent potential attacks.

• Denial-of-service attacks may occur if the vulnerability is exploited.
• Network administrators need to verify that their Junos OS Evolved version is not affected.
• Patching or mitigating this vulnerability should be prioritized to prevent potential attacks.

Technical summary

The vulnerability is due to improper validation of specified quantity in input in the routing protocol daemon (rpd) of Juniper Networks Junos OS Evolved on PTX Series. An unauthenticated IS-IS peer can cause a denial of service by exploiting this vulnerability.

Defensive priority

Network administrators should prioritize patching or mitigating this vulnerability to prevent potential denial-of-service attacks.

Recommended defensive actions

• Network administrators should assess exposure and prioritize patching or mitigating this vulnerability.
• Verify that the Junos OS Evolved version is not affected by checking the vendor's advisory.
• Implement compensating controls, such as monitoring for suspicious IS-IS peer activity.

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. The affected versions of Junos OS Evolved are listed in the source item.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.