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CVE-2026-102042 Juniper Networks CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-14T16:51:59.992Z and has not been modified since then. A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to crash the routing process via RSVP-TE associated-bidirectional LSP signaling. The vulnerability affects various versions of Junos OS and Junos OS Evolved, including those prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2. Network administrators and security teams should prioritize verifying and applying vendor-provided patches, reviewing their

Vendor
Juniper Networks
Product
Junos OS
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Network administrators and security teams responsible for Juniper Networks Junos OS and Junos OS Evolved systems should assess exposure and prioritize patching, particularly for versions prior to the recommended fixes.

Why it matters

CVE-2026-102042 is a medium-severity vulnerability in Juniper Networks Junos OS and Junos OS Evolved that allows an adjacent attacker to crash the routing process. Network administrators and security teams should prioritize verifying and applying vendor-provided patches, reviewing inventory, and monitoring network activity.

  • Crash of routing process via RSVP-TE associated-bidirectional LSP signaling requires verification of affected versions and application of vendor-provided patches
  • Network stability and security may be impacted if vulnerable versions are not patched
  • Verification of inventory and monitoring for unusual activity related to RSVP-TE associated-bidirectional LSP signaling is necessary

Technical summary

A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker to crash the routing process via RSVP-TE associated-bidirectional LSP signaling. Affected versions include Junos OS prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2, as well as Junos OS Evolved prior to 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.4R1-S3-EVO, and 26.2R1-S2-EVO.

Defensive priority

Network administrators and security teams should prioritize verifying and applying vendor-provided patches for Juniper Networks Junos OS and Junos OS Evolved, particularly for versions prior to 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, and 26.2R1-S2.

Recommended defensive actions

  • Verify and apply vendor-provided patches for Juniper Networks Junos OS and Junos OS Evolved
  • Review and update inventory to identify affected systems
  • Monitor network for unusual activity related to RSVP-TE associated-bidirectional LSP signaling
  • Consider implementing compensating controls for RSVP-TE associated-bidirectional LSP

Evidence notes

The CVE record and associated source item provide details on a Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved. An adjacent attacker can cause the routing process to crash via RSVP-TE associated-bidirectional LSP signaling. The vendor has provided an advisory (JSA112187) with affected versions and recommended actions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-102042 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-102042

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-102042 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-102042

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.