Advisory severityHigh7.5Juniper Networks

High [CVE-2026-101948] Junos OS and Junos OS Evolved: A specific BGP FlowSpec update causes an rpd crash when BGP FlowSpec import policy is used

This high-severity Juniper Networks advisory covers CVE-2026-101948 affecting Junos OS, Junos OS Evolved.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-101948 Source published Oct 15, 2026Source updated Oct 15, 2026

VulniPulse record published Oct 15, 2026Record updated Oct 15, 2026

CVE-2026-101948

Affected products & platforms

Juniper NetworksJunosJunos OS Evolved

Open source advisory

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Summary

A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote unauthenticated BGP peer to cause a denial of service via a specific BGP FlowSpec update received by an affected BGP session.

Affected versions

Junos OS 25.2 before 25.2R2-S2
Junos OS 25.4 before 25.4R1-S3
Junos OS 26.2 before 26.2R1-S2
Junos OS Evolved 25.2 before 25.2R2-S2-EVO
Junos OS Evolved 25.4 before 25.4R1-S3-EVO
Junos OS Evolved 26.2 before 26.2R1-S2-EVO
Junos OS Evolved 23.4X100
Junos OS Evolved 25.2X100 before 25.2X100-D35-EVO
Junos OS Evolved 25.4X300 before 25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions

25.2R2-S2
25.4R1-S3
26.2R1-S2
25.2R2-S2-EVO
25.4R1-S3-EVO
26.2R1-S2-EVO
25.2X100-D35-EVO
25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote unauthenticated BGP peer to cause a denial of service via a specific BGP FlowSpec update received by an affected BGP session.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Juniper Networks
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-101948 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-101948NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 25.2R2-S2 / 25.4R1-S3 / 26.2R1-S2)
Official documentation
This advisory names 25.2R2-S2 / 25.4R1-S3 / 26.2R1-S2 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

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