Quick answers
- Is CVE-2026-102027 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102027 being exploited in the wild.
- How severe is CVE-2026-102027?
- High severity, with a CVSS score of 7.5, published 14 October 2026.
- Which products and versions are affected?
- Juniper Networks Junos OS; Juniper Networks Junos OS Evolved.
- Is there a fix for CVE-2026-102027?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-102027 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-102027?
- Check whether you run Juniper Networks Junos OS or Juniper Networks Junos OS Evolved. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An incorrect buffer size calculation in the routing protocol daemon (rpd) allows a remote eBGP neighbor to trigger a denial of service by sending specially crafted BGP labeled-unicast UPDATE messages. The vulnerability is triggered only when multipath features are enabled in the affected system, requiring a pre-established BGP session with the device.
Affected products
- Juniper Networks Junos OS
- Juniper Networks Junos OS Evolved
Timeline
- 2026-10-14: disclosed