---
title: "CVE-2026-114139: Sentry-Javascript: Middleware Bypass when using Tunnel route"
url: https://erroneo.us/security/cve/CVE-2026-114139/
description: "CVE-2026-114139 (@sentry/nextjs (npm)): Sentry-Javascript is an official Sentry SDKs for JavaScript. From 9.36.0 until 9.47.2, 10.75.2, and 11.0.0-rc.1, the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-21
date_modified: 2026-10-22
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-114139"
kev: false
cvss: 9.1
epss: 0.00407
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-114139: Sentry-Javascript: Middleware Bypass when using Tunnel route

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 34: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 34% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @sentry/nextjs (npm) >= 9.36.0, < 9.47.2, fixed in 9.47.2 ; @sentry/nextjs (npm) >= 10.0.0-alpha.0, < 10.75.2, fixed in 10.75.2 ; @sentry/nextjs (npm) >= 11.0.0-alpha.0, < 11.0.0-rc.1, fixed in 11.0.0-rc.1 . Check your lockfile, including transitive dependencies.

## What it is

Sentry-Javascript is an official Sentry SDKs for JavaScript. From 9.36.0 until 9.47.2, 10.75.2, and 11.0.0-rc.1, the webpack integration for @sentry/nextjs skips application middleware for every request path under a configured tunnelRoute, while the tunnel rewrite serves only the exact tunnel path with valid o and p query parameters. When an application route directly collides with the tunnel path or a root dynamic segment resolves under it, an unauthenticated request can reach that route without middleware authorization. Exploitation requires tunnelRoute, a webpack build, a colliding route, and middleware being the only authorization control. This issue is fixed in versions 9.47.2, 10.75.2, and 11.0.0-rc.1.

## Affected packages

- npm `@sentry/nextjs` >= 9.36.0, < 9.47.2 → fixed: 9.47.2
- npm `@sentry/nextjs` >= 10.0.0-alpha.0, < 10.75.2 → fixed: 10.75.2
- npm `@sentry/nextjs` >= 11.0.0-alpha.0, < 11.0.0-rc.1 → fixed: 11.0.0-rc.1

## Affected products (CVE record)

- getsentry sentry-javascript: >= 9.36.0, < 9.47.2, >= 10.0.0-alpha.0, < 10.75.2, >= 11.0.0-alpha.0, < 11.0.0-rc.1

## Severity

- GitHub_M CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- FIRST EPSS (model of 2026-10-22): 0.41% probability of exploitation activity in the next 30 days; percentile 34.

## Sources

- [GitHub Advisory GHSA-mchm-gjx6-7h55](https://github.com/advisories/GHSA-mchm-gjx6-7h55)
- [CVE.org record CVE-2026-114139](https://www.cve.org/CVERecord?id=CVE-2026-114139)
- [NVD entry CVE-2026-114139](https://nvd.nist.gov/vuln/detail/CVE-2026-114139)
- [github.com](https://github.com/getsentry/sentry-javascript/security/advisories/GHSA-mchm-gjx6-7h55)
- [github.com](https://github.com/getsentry/sentry-javascript/pull/24499)
- [github.com](https://github.com/getsentry/sentry-javascript/pull/24565)
- [github.com](https://github.com/getsentry/sentry-javascript/pull/24760)
- [github.com](https://github.com/getsentry/sentry-javascript/commit/878b685c85dc12045e47e1932c96f5381d7ac532)
- [github.com](https://github.com/getsentry/sentry-javascript/commit/c122aac4f29541eb6da494296822c91eab3cf5ae)
- [github.com](https://github.com/getsentry/sentry-javascript/commit/d525a2f6015b47384bc139c30d58e0d5435d52e5)
- [github.com](https://github.com/getsentry/sentry-javascript/releases/tag/10.75.2)
- [github.com](https://github.com/getsentry/sentry-javascript/releases/tag/11.0.0-rc.1)
- [github.com](https://github.com/getsentry/sentry-javascript/releases/tag/9.47.2)

---
Source page: https://erroneo.us/security/cve/CVE-2026-114139/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt