---
title: "CVE-2026-101965: Juniper Networks Junos OS Evolved - Use of Externally-Controlled Format String"
description: "Juniper Networks Junos OS Evolved contains a use of externally-controlled format string vulnerability in the gRPC daemon, letting authenticated network attackers cause telemetry-service disruption, information disclosure, or root-level code execution via crafted gNMI messages."
url: https://panop.io/threat-heartbeat/CVE-2026-101965/
---

# CVE-2026-101965 Juniper Networks Junos OS Evolved - Use of Externally-Controlled Format String

Juniper Networks Junos OS Evolved contains a use of externally-controlled format string vulnerability in the gRPC daemon, letting authenticated network attackers cause telemetry-service disruption, information disclosure, or root-level code execution via crafted gNMI messages.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101965)

## Details

Type

Use of Externally-Controlled Format String

Impact

Denial Of Service, Information Disclosure, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-134](https://cwe.mitre.org/data/definitions/134.html)

## Vendor fix

Update to the latest Junos OS Evolved version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-101965](https://nvd.nist.gov/vuln/detail/CVE-2026-101965)
- [https://supportportal.juniper.net/JSA112250](https://supportportal.juniper.net/JSA112250)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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