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Response snapshot Oct 27, 2026, 00:06 UTC

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VulnerabilityCVE-2026-114139

Sentry-Javascript: Middleware Bypass when using Tunnel route

The `tunnelRoute` option makes the SDK send browser events to a path on your own Next.js server (for example `/monitoring`), where a rewrite forwards them to Sentry to prevent ad blockers from blocking them.

At a glance

Exploited
Not known
Severity
9.1 Critical (CVSS 4.0)
Chance of exploitation
0.5% in the next 30 days
Sources
2 independent sources

What to do

GitHub lists first patched versions: @sentry/nextjs: 9.47.2; @sentry/nextjs: 10.75.2; @sentry/nextjs: 11.0.0-rc.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-mchm-gjx6-7h55 (opens a new tab)

What happened

### Impact

The `tunnelRoute` option makes the SDK send browser events to a path on your own Next.js server (for example `/monitoring`), where a rewrite forwards them to Sentry to prevent ad blockers from blocking them. To keep those envelope requests from being rejected by your middleware, the SDK skips middleware for them.

The middleware skip was wider than the rewrite. The rewrite only serves requests to the tunnel path itself with the `o` and `p` parameters set. The skip applied to anything under the tunnel path. Requests in that gap go to your application instead of Sentry, and your middleware never runs on them.

Skipping middleware does not grant the request any privileges. Routes that check the session server-side are still protected.

Continue reading

You are affected only if **all** of the following are true:

1. `tunnelRoute` is set (a string path or `true`), 2. your app is built with **webpack** (Turbopack builds are not affected), 3. some route of your application resolves under the tunnel path. That could be a direct collision (`/monitoring/foo` with `tunnelRoute: '/monitoring'`) or a dynamic segment at the route root (`app/[locale]/…`), which matches any first path segment, and 4. your middleware is the only place that enforces authorization for those routes.

Sentry's own services, and the data in your Sentry organization, are not affected.

### Patches

Fixed in [9.47.2](https://github.com/getsentry/sentry-javascript/releases/tag/9.47.2), [10.75.2](https://github.com/getsentry/sentry-javascript/releases/tag/10.75.2) and [11.0.0-rc.1](https://github.com/getsentry/sentry-javascript/releases/tag/11.0.0-rc.1). The skip now matches only the requests the tunnel rewrite actually serves. No configuration change is needed.

### Workarounds

- Set `tunnelRoute` to a path no route of yours can resolve under, or remove the option. - Build with Turbopack (default for `next build` from Next.js 16). - Enforce authorization in the route, layout or data-access path as well as in middleware.

Affected package ranges reported by GitHub: @sentry/nextjs: >= 9.36.0, < 9.47.2 @sentry/nextjs: >= 10.0.0-alpha.0, < 10.75.2 @sentry/nextjs: >= 11.0.0-alpha.0, < 11.0.0-rc.1

Scores and how they were measured

CVSS base severity

9.1

Version 4.0As of

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.5%

Scored Percentile 43.2%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-mchm-gjx6-7h55 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  4. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  5. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  6. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  7. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  8. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  9. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  10. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  11. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mchm-gjx6-7h55, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  12. Primary source

    NVD CVE-2026-114139 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  13. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  14. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-114139, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 22). Sentry-Javascript: Middleware Bypass when using Tunnel route (CVE-2026-114139). https://kevwire.com/record/CVE-2026-114139

MLA

"Sentry-Javascript: Middleware Bypass when using Tunnel route (CVE-2026-114139)." KEVWire, 22 Oct. 2026, kevwire.com/record/CVE-2026-114139.

Chicago

KEVWire. "Sentry-Javascript: Middleware Bypass when using Tunnel route (CVE-2026-114139)." Last modified October 22, 2026. https://kevwire.com/record/CVE-2026-114139.

Evidence summary (plain text)

Sentry-Javascript: Middleware Bypass when using Tunnel route (Oct 22, 2026).
The `tunnelRoute` option makes the SDK send browser events to a path on your own Next.js server (for example `/monitoring`), where a rewrite forwards them to Sentry to prevent ad blockers from blocking them. To keep those envelope requests from being rejected by your middleware, the SDK skips middleware for them.

The middleware skip was wider than the rewrite. The rewrite only serves requests to the tunnel path itself with the `o` and `p` parameters set. The skip applied to anything under the tunnel path. Requests in that gap go to your application instead of Sentry, and your middleware never runs on them.
CVSS 9.1 (version 4.0; evidence as of Oct 22, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-114139).
EPSS 0.5% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-114139&date=2026-10-26).
Sources:
GitHub-reviewed advisory GHSA-mchm-gjx6-7h55: https://github.com/advisories/GHSA-mchm-gjx6-7h55
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo1MTozMFrOAAf0Mg%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0OToxMlrOAAf0LQ%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0NzoxN1rOAAf0Kg%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0NTozNlrOAAf0Jw%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0NTowNVrOAAf0JQ%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0Mzo0NVrOAAf0Iw%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QyMDo0MzozMVrOAAf0Ig%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QxODozNTowMVrOAAZRcw%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QxODozMDoyN1rOAAY_5Q%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yM1QxODoyOTowNVrOAAfz8g%3D%3D
NVD CVE-2026-114139: https://nvd.nist.gov/vuln/detail/CVE-2026-114139
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?pubStartDate=2026-10-12T13:35:55.142Z&pubEndDate=2026-10-26T13:35:55.142Z&resultsPerPage=500&startIndex=8000
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-114139&date=2026-10-26
Record ID: CVE-2026-114139.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 19:40 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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